Receive Side Scaling How It Works. Receive-Side Scaling State (RSS) (Editable with the TCP Optimi

Receive-Side Scaling State (RSS) (Editable with the TCP Optimizer) It is sometimes useful to disable RSS if you need to reduce CPU load. I want to disable the RSS because it gives some performance issues, so executed the command "netsh int tcp set global rss=disabled" and when I checked at the Network adapter properties, I still see the Recieve Receive side scaling (RSS) is a network driver technology that enables the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems. What might be preventing you from seeing this option? Answer The NIC does not support RSS. Mar 13, 2019 · Modern Network Cards support Receive Side Scaling. g. 5-5 GBit/s/core. LAN RSS LAN RSS applies to a particular TCP connection. Description The Set-NetAdapterRss cmdlet sets the receive side scaling (RSS) properties on a network adapter. If "Receive Window Auto-Tuning Level" is disabled, type netsh interface tcp set global autotuninglevel=normal and press Enter. RSS improves system performance and increases network scalability by harnessing all available processors in a system and dynamically rebalancing CPU workloads. I want to disable the RSS because it gives some performance issues, so executed the command "netsh int tcp set global rss=disabled" and when I checked at the Network adapter properties, I still see the Recieve Changes in the VMXNET3 driver: Receive Side Scaling (RSS): Receive Side Scaling is enabled by default. I've been enabling it with Set-NetAdapterAdvancedProperty -DisplayName 'Receive Side Scaling' -DisplayValue 'Enabled'. * Disable Large Send Offload. Now i can barely manage 40MB/s, with usually being around 35-36MB/s on Receive Side Scaling (RSS): Sets the number of RSS queues that enable the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems. And this is the result (and the lags are completely gone): More results and the full story can be found here. On Server 2012 or R2 you can enable it using a simple PowerShell command. Choices are something like 2,4,8,16. Without RSS, all of the processing is performed by a single processor, resulting in inefficient system cache utilization. Jan 9, 2022 · it requires RSS to work the number of netmap threads created depends on the number of RSS queues available on the NIC. Right-click on your network adapter and select Properties. Provides the steps required to configure NetPerf sessions to fully use the receive queues in Windows. 3 Receive Side Scaling and Dynamic Virtual Machine Queuing Example scenarios on how to configure RSS Scenario 1 - How do I configure RSS Packets for each flow are steered to a separate receive queue, which in turn can be processed by separate CPUs. The goal of RSS and the other scaling techniques is to increase performance uniformly. Trying to get SMB multichannel working on this Intel NIC but I dont have Receive Side Scaling (RSS) - in the adapter properties. Based upon its current RSS configuration, a miniport driver or a NIC determines the target processor to associate with the received data. Go to Device Manager, go into Properties of both ethernet cards, Advanced tab, and make sure "Receive Side Scaling" is enabled. 80 and later support RSS Version 2 (RSSv2), which extends RSS by offering dynamic, per-VPort spreading of queues. Virtual Receive-side scaling in Windows Server 2012 R2 is easily enabled and managed inside the virtual machine, much like a physical host, using the same PowerShell cmdlets that are used for Receive-side scaling in a physical host. I was using Realtek Gaming 2. Feb 23, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Receive Side Scaling (RSS) is a great technology that is necessary when you move from 1Gb links to 10Gb links, as typically a network connection is processed only by a single processor core. RSS is a Microsoft Scalable Networking initiative technology that enables receive processing to be balanced across multiple processors in the system while maintaining in-order delivery of the data. Should this been done? We will also explain the importance of enabling Receive Side Scaling, which allows your computer to better manage incoming network traffic by distributing it across multiple CPU cores. Most of you probably also use the => 10G NIC mainly Jun 1, 2023 · CrowdSec ZenArmor I also enabled RSS (Receive Side Scaling) even though I see my network driver (igc) is not explicitly supported. Receive Side Scaling When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. Mar 3, 2023 · Receive side scaling (RSS) is a network driver technology that enables the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems. TCP Checksum Offload (IPv4). Nov 5, 2025 · Receive side scaling (RSS) is a network driver technology that efficiently distributes network receive processing across multiple CPUs in multiprocessor systems. This mechanism assumes some hash function, that performs calculations based on packet parameters, and sends the packet to relevant queue. This mechanism is generally known as “Receive-side Scaling” (RSS). For further information on Microsoft RSS, see Introduction to Receive Side Scaling For more information on Linux Receive Side Scaling, see RSS and multiqueue support in Linux driver for VMXNET3. Mar 24, 2023 · Perhaps RSS isn't the problem. The Get-NetAdapterRss cmdlet gets receive side scaling (RSS) properties of the network adapters that support RSS. 3. Apr 27, 2010 · Secondly, does RSS (Receive Side Scaling) work similarly in both Windows and Linux systems? I can only find detailed explanations on how RSS works in MSDN articles, where they talk about how RSS (and MSI-X) works on Windows Server 2008. Jun 4, 2013 · A. Feb 10, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Jan 25, 2020 · Re: How to correctly set Receive Side Scaling (RSS) by UFO_Pilot » 18 Aug 2024, 20:29 Doesn't RSS only works if taskoffloads are enabled? (onboard network card processor) Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters DisableTaskOffload 1 Receive Side Scaling Receive Side Scaling (RSS) is a very important aspect in networking on Windows. Answer Virtual Machine Queue DCB Exchange Receive Side Scaling Quality of Service (QoS), You want to use RSS. Jun 30, 2015 · RSS - Receive Side Scaling In the previous article we mentioned that the NIC hashes packets in order to spread the load across many RX queues. The Enable-NetAdapterRss cmdlet enables receive side scaling (RSS) on a network adapter. * Disable IPv4 Large Send Offload (LSO). 0 resolves single-CPU processing issues by implementing Receive-Side Scaling (RSS). Per Microsoft’s website, Virtual Receive-side scaling (RSS) is a feature in Windows Server 2012 R2 that allows the load from a virtual network adapter to be distributed across multiple virtual processors in Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. To return all available RSS properties, use the following command: Get-NetAdapterRss slot 6 2. The NIC distributes packets by applying a filter to each packet that assigns it to one of a small number of logical flows. Pick the closet one without going over. It is the same setting that can be enabled/disabled at the OS level using our tweaking articles and the TCP Optimizer for newer Windows versions. 5GbE Family Controller before this and that adapter had all these settings. But something was wrong and causing latency in games. This could be checked with "Task Monitor". Dec 22, 2023 · Receive Side Scaling (RSS): Enable RSS to distribute data processing across multiple CPU cores, enhancing performance for systems with multiple processors. 0. May 17, 2012 · Receive Side Scaling (RSS): This enables the distribution of incoming network processing across multiple processor cores in multi-core computers, to help increase performance. It is also possible that a driver does not expose this ability to the user, in which case you'd want to look up whether the NIC/driver supports RSS at all – using online datasheets or a simple google search. NIC RSS on or off Gaming latency? Does it really matter? Latency should be negligable either way I imagine. To get task offload information about a specific connection, at the command prompt, run: Mar 1, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Jul 31, 2013 · While since In Windows Server 2012, Receive Side Scaling (RSS) over SR-IOV is supported it’s best suited for some specialized environments that require the best possible speeds at the lowest possible latencies. How to do it: * On each NIC inside the Broadcom Advanced Control Suite (BACS) (Instructions for disabling features without BACS are listed below. Apr 5, 2014 · To use Receive Side Scaling (RSS), network adapters and Operating Systems need to support it. * Disable Receive Side Scaling (RSS). ax. Mar 13, 2023 · Receive Side Scaling improves the system performance related to handling of network data on multiprocessor systems. Turn off flow control Turn off interrupt moderation Turn off Wake on Pattern/Wake on Magic Pattern Turn off TCP Offload Feb 7, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Without RSS, the data traffic of a NIC only runs over one core and this can only handle a certain bandwidth depending on the performance/clock. Trying to get RSS (Receive Side Scaling) to work on an Intel X710 NIC. 30 rendering the functionality unusable. The administrator can reserve a set of processors starting at logical CPU number 0 and ending at a specified CPU number. Apr 1, 2014 · Needs Checksum Offload to be enabled to work. Jan 15, 2019 · Receive Side Scaling (RSS) = ENABLE (This setting is a very important performance parameter) RSS Base processor Number = 0 Maximum Number of RSS processors = 4 (Depends on the number of Processors available on the server. 10 Gigabit Network Cards generally have better and more configurable device drivers than 1 Gigabit Network Cards. The best practice is to enable RSS for performance improvements. Feb 25, 2025 · Hey there, i am sure many people here are familiar with the issue of slow SMB throughput to SMB network shares which started to happen (for me at least) with Windows 11 24H2. RSS only works on Hyper-V. Troubleshooting Jun 19, 2014 · Ethan44 Posted Jul 04, 2014 12:56 PM Reply Reply Privately Hi Welcome to communities. Dec 7, 2015 · Set Receive Side Scaling (RSS) to ENABLED Set number of RSS Queues to a higher value value (2 in my case) Receive Side Scaling (RSS) helps utilize multiple CPU cores in order to process received network packets faster and spread CPU utilization across many CPU cores. The NIC card can have built in features/offloading to assist without RSS but ya, it would get sent to a single core on the receiving side. Jun 5, 2024 · I am specifically looking for instructions on how to enable, disable and monitor the use of Recieve Side Scaling (RSS) technology on my Ubuntu system. Jul 21, 2022 · In this article, we will show you how to enable RSS on all Hyper-V Virtual Machines using PowerShell. RSS can be used to relieve bottlenecks in receive interrupt processing caused by overloading a single CPU, and to reduce network latency. We can launch the NIC properties of "Device Manager" to make sure "Receive Side Scaling" is supported by this NIC. Disable Receive Side Scaling, Receive Segment Coalescing, TaskOffload Set-SMBClientConfiguration Disable LargeMTU Disable BandwidthThrottling Network Adapter Properties I also agree on Buffers, just enough but not maxed out. Jan 31, 2025 · Receive Side Scaling improves the system performance related to handling of network data on multiprocessor systems. For example Receive Side Scaling (RSS) improves network performance by distributing incoming traffic across multiple CPUs, and this guide explains its configuration in RHEL. Improve throughput and efficiency—read more. We can see it in action by observing the /proc/net/softnet_stat file with the softnet. RSS and Virtual RSS (vRSS) allows you to dedicate processors for managing network load between NICs. Most current network adapters offer a capability called Receive Side Scaling (RSS), which enables multiple connections to automatically spread across multiple CPU cores. This auto load balancing greatly What is receive side scaling? When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. I am also running on win Mar 1, 2025 · Receive Side Scaling (RSS) is a feature that allows network packets from a single NIC to be scheduled in parallel on multiple CPUs by creating multiple hardware queues. To show the available adapters and their names used in subsequent steps, use the following command: Get-Netadapter For this example, Slot 6 2 is used, which indicates a Broadcom single-port 50 Gb/s adapter. This is done by spreading the calculations across multiple CPU cores. Multiqueue / RSS (Receive Side Scaling) NIC with Multiple Send/Receive Queues Explore with “ethtool -l {ifname}” Modify with “ethtool -L {ifname} {parm} {value}” Each has it’s own interrupt Used to distribute queue among multiple CPUs Examine /proc/interrupts for details Sep 21, 2020 · Attempting to specify an interface name (e. Aug 31, 2016 · It must be enabled in the virtual machine using PowerShell cmdlets. Apr 6, 2018 · We can achieve this in three ways, depending on what we use the adapter for: Enable Receive Side Scaling (RSS) and configure it to use specific cores. The receive side is a little bit more complicated since the hardware device plays an autonomous role in receive packet steering. The requirements, according MS, are one of: Multiple network adapters One or more network adapters that support Receive Side Scaling (RSS) One of more network adapters that are configured by using NIC Teaming One or more network adapters that support remote direct memory access (RDMA) I don't have multiple network Receive Side Scaling - "This feature could not increase total throughput. Feb 7, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Yes you must be enable Side Scaling is enabled on your NIC. It is also recommending to turn off Receive Window Auto-Tuning Level from Normal As well as to disable Receive-Side Scaling State The customer is running a 37 user network all using TS. split the RSS driver side, the RSS packet input side and the RSS stack side of things up into separate options; UDP IPv6 RSS support would be nice (it works, but i need to test/integrate bz's v6 udp locking changes for it to really matter); work on scaling linearly on incoming /and/ outgoing connections. Like the step title says, ensure the OS power management profile is set to the ‘High performance’ plan. Double-click the Network adapters option to expand it. The following technologies are described: RSS: Receive Side Scaling RPS: Receive Packet Steering RFS: Receive Flow Steering Accelerated Receive Flow Steering XPS Packets for each flow are steered to a separate receive queue, which in turn can be processed by separate CPUs. rss_enabled = 1 dev. If RSS is disabled, network traffic is processed on a single processor core. Note: This setting has no Jan 15, 2025 · Here you can see the Advanced tab in the network adapter properties that shows the TCP Connection Offload and Receive Side Scaling (RSS) settings. Nov 8, 2024 · Receive Side Scaling (RSS) enables NICs to provide more consistent resource consumption across multiple CPUs on multiprocessor platforms. If we do not use RSS, network processing is bound to one processor which will limit approximately at 4GBps. By default, Windows Server usually picks a single CPU to process network traffic handling on. Feb 6, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Mar 23, 2017 · Regardless, it bears noting that “this will not work properly if the system BIOS has been set to disable operating system control of power management” (TechNet). To see the settings for the operating system, use net shell command netsh interface tcp show global command as follows: You can check the following two other settings that affect TCPchimney offloading: Jan 25, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Mar 11, 2020 · Products Windows 2012R2 Description RSS abbreviated for Receive Side Scaling, should be enabled on a VM Server as it betters performance. When the receive side data increases it creates a bottleneck at the single core. Chances are you know it better than the other mentioned optimizations. Work is underway to address this issue since the new Netmap API (V14+) is now capable of increasing this thread count. The indirection table is what must be manipulated. Distributing traffic across multiple NICs is called multipathing or SMB3 Multichannel. LAN RSS Dec 14, 2016 · The traffic that goes from the wire to the kernel can be spread into different queues, using a mechanism called RSS - Receive Side Scaling. While this might increase network throughput for a NIC that receives packets at a high rate, it can also increase CPU overhead. Feb 3, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. May 23, 2023 · Is this page helpful? Receive Side Scaling (RSS) System Requirements Operating Systems: Windows Server 2012, Windows Server 2012 R2, Windows 7 Client, Windows 8. I was wondering if there is any trick to getting RSS to work with a VMXNET3 network adapter on Windows Server Core 2016? I have a number of Server 2016 Core VMs and on some of them it works, on others it does not. Scaling in the Linux Networking Stack Introduction ============ This document describes a set of complementary techniques in the Linux networking stack to increase parallelism and improve performance for multi-processor systems. Enable Virtual Message Queueing and configure it to use specific cores Set the preferred NUMA node For physical machines On network adapters used for generic traffic, we should enable RSS and Feb 23, 2025 · Packet steering is used in both transmit and receive. I want to disable the RSS because it gives some performance issues, so executed the command "netsh int tcp set global rss=disabled" and when I checked at the Network adapter properties, I still see the Recieve side scaling is enabled. These attributes include the source and destination IP addresses, protocol type, and port numbers associated with each incoming packet. Feb 27, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. Feb 13, 2012 · When we’ll be discussing DVMQ (see DMVQ In Windows 8 Hyper-V), SR-IOV in Windows 8 (or VMQ/VMDq in Windows 2008 R2) and other network features with their benefits, drawbacks and requirements it helps to know what Receive Side Scaling (RSS) is. Jul 17, 2021 · Checksum offloading is also required for other stateless offloads to work including receive side scaling (RSS), receive segment coalescing (RSC), and large send offload (LSO). I don't think I can make RSS work tried for hours added keys deleted some, tried different drivers 1 2 or 4 Queues and the InderectionTables never show up on screen. Receive Side Scaling allows multiple cores on the receive side for processing incoming traffic. Aug 26, 2019 · Introduction to Receive Side Scaling (RSS) Overview A network interface card (NIC) can be configured with multiple receive queue (Rx). Without RSS, receiving ESXi hosts only use one physical queue and hence one lcore for packet processing. Nov 1, 2024 · Checksum offloading is also required for other stateless offloads to work including receive side scaling (RSS), receive segment coalescing (RSC), and large send offload (LSO). RSS makes sure that incoming network traffic is spread among the available processors in the server for processing. Important performance parameter) Mar 11, 2025 · Reference Guide Articles Here are some links to our Reference Guide, which you may find useful when using and configuring RSS. ) * Disable IPv4 Checksum Offload. May 25, 2024 · Re: How to correctly set Receive Side Scaling (RSS) by UFO_Pilot » 22 Aug 2024, 07:25 Receive-Side Scaling (RSS)[18] ensures flow to core afinity by hashing fields of the packets to select a “bucket” in an indirection table, as shown in Figure 2. Dec 2, 2025 · Describes Receive Side Scaling (RSS) and how to configure RSS on an Intel® Network Adapter. Jul 10, 2025 · * Disable Receive Side Scaling. lagg0 or vlan101) did not work and caused the SMB daemon not to start because it couldn’t find any working interfaces. I am on a 1Gbit NIC, connecting to my Synology NAS and for larger files i was always able to saturate the speed by reaching round about 115MB/s. Nov 15, 2023 · Receive Side Scaling (RSS) >> ON (WITH QUEUE VALUE OF 4) I have downloaded the latest Realtek LAN driver from Realtek's website, which has a little bit different settings and values than the one that comes from my motherboard's support website, which one would be better to use? The TCP/IP speed tweaks below work with Windows 8, 10, 2012/2019 Server. Jun 9, 2022 · Windows Server 2016, Windows Server 2012, Windows Server 2012 R2, Windows Server 2008 R2, and Windows Server 2008 support Receive Side Scaling (RSS). autotuninglevel - One of the following values: disabled: Fix the receive window at its default value. Aug 16, 2021 · [Tutorial/Call for Testing] Enabling Receive Side Scaling on OPNsensedev. To change/check the power profile: In this example, Receive-Side Scaling State and Chimney Offload State are both disabled. Some servers are configured with multiple logical processors that share hardware resources (such as a physical core) and which are treated as Simultaneous Multi-Threading (SMT) peers. 80 and later support RSS Version 2 (RSSv2), which extends RSS by offering per-VPort spreading of queues. In most cases you can expect around 2. May 25, 2024 · Re: How to correctly set Receive Side Scaling (RSS) by NotaBotY2k » 19 May 2025, 21:44 I've had issues on different pc's and the rss settings seemed to be the issue now. and dont rtequire to restart server just start services if nto work then need torestart server. I want to disable the RSS because it gives some performance issues, so executed the command "netsh int tcp set global rss=disabled" and when I checked at the Network adapter properties, I still see the Recieve Jan 25, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. By Default, RSS is enabled on Server 2016 and 2019 but cannot be enabled on Windows Server 2008 R2 or below. Dec 31, 2019 · disabled: Disable receive-side scaling. Note: On upgrading VMware Tools, the driver-related changes do not affect the existing configuration of the adapters. msc in the run box. UDP Checksum Offload (IPv4). Mar 18, 2023 · Learn how to enable Receive Side Scaling (RSS) on the network adapter. RSS enables network adapters to distribute the kernel-mode network processing load across multiple processor cores in multi-core computers. The current Suricata/Netmap implementation limits this re-injection to one thread only. If "Receive Window Auto-Tuning Level" is disabled, type netsh interface tcp set global autotuninglevel=normal and press enter. Receive-Side Scaling (RSS), also known as multi-queue receive, distributes network receive processing across several hardware-based receive queues, allowing inbound network traffic to be processed by multiple CPUs. enabled : Enable receive-side scaling. Click the OK button to open Device Manager. Jul 21, 2025 · On some systems it has to be enabled manually. Jan 28, 2025 · Therefore, the potential for a performance bottleneck is significant. Get-SmbMultichannelConnection reports False. Nov 7, 2022 · Hi Friends, In times of NICs with =>10G, RSS (Receive Side Scaling) is essential in most cases in order to be able to use their full performance. Nov 20, 2013 · Severity: Warning Enable Receive Side Scaling (RSS) on a network adapter What is Receive Side Scaling (RSS)? Per Microsoft's website, Virtual Receive-side scaling (RSS) is a feature in Windows Server® 2012 R2 that allows the load from a virtual network adapter to be distributed across multiple virtual processors in a virtual machine. 1. This is not an official video but our own recording of our presentation of "RSS++: load and state-aware receive side scaling" at CoNEXT'19 by Tom Barbette, G 17K subscribers in the opnsense community. Jan 7, 2019 · Re: How to correctly set Receive Side Scaling (RSS) by UFO_Pilot » 21 Aug 2024, 07:08 @MatrixQW and @Anonymous thank's for the help, appreciated. Aug 12, 2024 · What's RSS? RSS, short for Receive Side Scaling, is an in-hardware feature that allows a NIC to "send different packets to different queues to distribute processing among CPUs. It designed for better CPU utilization. If "Receive-Side Scaling State" is disabled, type netsh interface tcp set global rss=enabled and press Enter. Each NET_ADAPTER_RECEIVE_SCALING_INDIRECTION_ENTRY structure in the NET_ADAPTER_RECEIVE_SCALING_INDIRECTION_ENTRIES array contains the hash index for that entry in the table, the new receive queue to which to assign the entry, and a status field indicating if that individual move succeeded or not. Receive Throttle: The default value of the receive throttle is set to 30. Receive Side Scaling Configuration The Receive Side Scaling (RSS) hashing algorithm relies on a combination of different attributes to calculate the hash value. Interrupt Moderation - clumps packets together and sends them as a batch - the main offender Flow Control - sounds counterintuitive to disable it, but it messes with existing flow control in Windows networking stack Receive Side Scaling - also messes with Windows networking stack [anything goes here] Checksum Offload - supposed to speed up Jul 7, 2017 · RSS: Receive Side Scaling - is hardware implemented and hashes some bytes of packets ("hash function over the network and/or transport layer headers-- for example, a 4-tuple hash over IP addresses and TCP ports of a packet"). highlyrestricted: Allow the receive window to grow beyond its default value, but do so very Oct 26, 2016 · Receive Side Scaling is not functional for VMXNET3 on Windows 8 and Windows 2012 Server or later This issue is caused by an update for the VMXNET3 driver that addressed RSS features added in NDIS version 6. Receive Side Scaling (RSS) is a feature that allows network packets from a single NIC to be scheduled in parallel on multiple CPUs by creating multiple hardware queues. So basically from my understanding depending on which offload you have selected, it calculates a Hash value and uses that to place your packet for processing on a specific Queue, which is binded to a specific CPU Dec 14, 2021 · The receive side scaling (RSS) interface accommodates several levels of NIC hardware support. Reliant on vendor implementation. The indirection table indicates where the So I am currently working on understanding how to Receive Side Scaling (RSS) Offloads work inside DPDK (Data Plane Development Kit). RSS Background Receive Side Scaling (RSS) Leveraging NIC Technology to Improve Network Performance in VMware vSphere See Section 4. 1. This post guides you through monitoring and tuning the Linux network stack with the focus on receiving data. sh script: Quick Review RSS is Receive Side Scaling and is a commonly used technology to disperse network traffic among multiple CPU cores on a physical host to load balance processing. RSS improves network performance by reducing processing delays and optimizing CPU utilization across your system. My machine is a 6 physical cores Xeon with Connect-X 3 EN dual-port. May 25, 2024 · Re: How to correctly set Receive Side Scaling (RSS) by UFO_Pilot » 22 Aug 2024, 07:25 Apr 1, 2019 · RSS abbreviated for Receive Side Scaling has value by being enabled on a Server as it betters performance. Hence we need to modify the receive window size to a bigger maximum value. Oct 16, 2024 · Receive Side Scaling distributes TCP processing for a particular connection to multiple CPUs/cores. Oct 29, 2012 · Receive Side Scaling - Disabled Receive Throttle - “Not Present” RSS Base Processor Number - “Not Present” Rx Ring #1 Size - “Not Present” Rx Ring #2 Size - “Not Present” Small RX Buffers - “Not Present” Speed and Duplex - Auto TCP Checksum Offload (IPv4) - Disabled TCP Checksum Offload (IPv6) - Disabled Tx Ring Size Receive Buffers - 512 Receive Side Scaling - Enabled Shutdown Wake-On-Lan - Disabled Speed & Duplex - Auto TCP Checksum Offload (IPv4) - Disabled TCP Checksum Offload (IPv6) - Disabled Transmit Buffers - 1024 (/2048) UDP Checksum Offload (IPv4) - Disabled UDP Checksum Offload (IPv6) - Disabled VLAN ID - 0 Wake on Magic Packet - Disabled NDIS 6. This is contrary to what the documentation says. set usb to 4 core gpu to 3 core your nic to 2 core (msi limit 2) [/quote] Receive Side Scaling When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. The Intel I211 Ethernet Controller supports 2 Receive Side Scaling (RSS) queues. The Spirent generator sends packets from many different flows to one interface and the Linux kernel forwards them to the other interface (unidirectional test). This isn’t much of an issue until 10G and above. Sep 27, 2024 · The receive side scaling (RSS) interface enables an administrator to reserve a set of processors for applications to use. Note Because hyper-threaded CPUs on the same core processor share the same execution engine, the effect is not the same as having multiple core processors. Feb 6, 2025 · Windows* Device Manager, advanced tab feature configuration settings, and definitions for Intel® Ethernet 10/100 and Gigabit Adapters. In this video, learn how to use Receive Side Scaling (RSS). RSS was first implemented with the scalable networking pack in 2003 SP2 and is still widely used today. Feb 13, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. NDIS 6. Jul 7, 2025 · Receive-side scaling (RSS) for web servers RSS can improve web scalability and performance when there are fewer network adapters than logical processors on the server. RSS is a scalability technology that distributes the receive network traffic among multiple processors by hashing the header of the incoming packet. May 23, 2024 · I just installed the I226-V adapter in my computer and when i went to change the advanced settings on it I couldn't find RSS Queues, transmit and receive buffer settings. Jan 25, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. If Receive-Side Scaling State is disabled, type netsh interface tcp set global rss=enabled and press enter. Without RSS all of the processing is performed by a single processor, resulting in less efficient system cache utilization. This is done to improve the throughput (i. Feb 18, 2014 · We have an SBS Server 2008 STD SP2 Upon Running the SBS BPA it is recommending to change the Add-On Congestion Control Provider from CTCP to disabled. Nov 4, 2023 · 0 Receive-side scaling is the NIC's ability to use multiple receive queues with separate interrupts and subsequently separate processing on different CPU cores. Until then, no benefit is gained from RSS when using IPS. RSS is a technology to distribute network processing over multiple processors thereby avoiding the bottlenecks seen above. RSS is a scalability technology that distributes the receive network traffic among multiple processors by hashing the header of the incoming packet and using an indirection table. If you don't see that option your NICs might not be able to support multichannel. I have tried different ways to activate and Mar 2, 2017 · Hi, I have few clarifications on the Receive side scaling (RSS) setting in a Windows 7 OS. When you search NIC properties, you do not see any options for RSS. This is useful on systems with older/slower CPUs where games tax the processor up to 100% at times. Ethernet advanced settings gaming optimization Press the Windows key + R and type devmgmt. e, the number of … Aug 31, 2016 · Receive Side Scaling (RSS) Note For information about virtual Receive-side Scaling (vRSS), see Virtual Receive-side Scaling in Windows Server 2012 R2. " Not true; enabling this doubled throughput on a card with two Ethernet ports; and quadrupled throughput on a card with four Ethernet ports, for a single file copy from a server. Jan 5, 2015 · Hello, I’m running RHEL 7 acting as a router and performing throughput tests. Sep 12, 2022 · Receive Side Scaling. However, if you use a single connection, RSS cannot help. When we’ll be discussing DVMQ (see DMVQ In Windows 8 Hyper-V), SR-IOV in Windows 8 (or VMQ/VMDq in Windows 2008 R2) and other network features with their benefits, drawbacks and requirements it helps to know what Receive Side Scaling (RSS) is. You need elevated privileges to configure RSS. However, offloading has been known to cause some issues, and disabling it can help avoid these issues. OPNSense documentation mentions: Quote Only enable this feature if you're interested in testing it and seeing if it will increase your throughput under high load – such as when using IDS/IPS. rss_enabled = 1 in the OPNsense System->Settings->Tunables interface. This technique is called RSS - Receive Side Scaling. Metron [25] dispatches packets to cores according to trafic classes, while Afinity-Accept[49] re-balances new connections. 1 Client and Windows Server 2016. default : Restore receive-side scaling state to the system default. Jan 25, 2020 · Re: How to correctly set Receive Side Scaling (RSS) by JimCarry » 19 Aug 2024, 23:52 now you can make affinity for all driver using specifed core for all. Now if the receiver’s receive window size is smaller, even after setting up window scaling option the sender can only send maximum data size equal to the receive window size configured at the receiver end. Mar 6, 2013 · On a physical server, Receive Side Scaling (RSS) processes incoming network traffic so that it isn't slowed down by a single CPU core. Go to your Network & Internet Settings then change adapter option and select properties, only the Internet Protocol Version 6 (TCP/IPv6) what you need to uncheck here then you go to the Client for Microsoft Networks (configure) and here you must disable Interrupt Moderation / Flow Control / Receive Side Scaling / TCP Checksum Offload (IPv4 . How many of you are using RSS (Receive-side scaling)? Should I be? Receive Side Scaling allows multiple cores on the receive side for processing incoming traffic. The overall throughput performance might decrease. By default there are 4 RX queues created by the driver for each interafce (largest May 24, 2025 · Learn how to set the number of receive side scaling (RSS) processors to optimize network performance. Windows Server 2012 and Windows Server 2012 R2 support Receive Side Scaling (RSS) and enabled by default. Interrupt generation is usually controlled by a hash (over IP addresses and L4 port numbers), so each flow is processed by a specific core.