Enabling Receive Side Scaling & IPsec Task Offload v2 on a Network Adapter

Question

Running the Best Practice Analyzer on a Windows Server 2012 RTM (this virtual server runs on a hyper-v host), I receive two configuration warnings.

enter image description here

Enable Receive Side Scaling (RSS) on a network adapter

I run the following PS cmdlet:

Enable-NetAdapterRss -Name *

output:

 Enable-NetadapterRss : The request is not supported.

 At line:1 char:1
 + Enable-NetadapterRss -Name *
 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : InvalidOperation: (MSFT_NetAdapter...1E300D0AB920}"):ROOT/StandardCi...rRssSettingData)
      [Enable-NetAdapterRss], CimException
      + FullyQualifiedErrorId : Windows System Error 50,Enable-NetAdapterRss

Next, Since, the PS cmdlet didn't work, I go to the network adapter settings. And, offcourse I don't see any option called Receive Side Scaling.

enter image description here

Enable IPsec Task Offload v2 (TOv2) on a network adapter

For this one, I go the network adapter properties (see the screen shot above), there is an option called IPSec Offload. It is set to Auth Header and ESP Enabled. But, BPA still complains that this settings is not enabled.

Do I have to enable these configuration settings on the hyper-v host's network adapter? I would like to know how I can configure these two options.

Update:

I ran the cmdlet Ryan mentioned below. Here is the output:

enter image description here

longneck · Accepted Answer · 2012-09-28T17:33:28.580

3

The following must occur to get rss and tcp offload in a hyper-v vm:

Host must have them enabled on the appropriate physical nics
The virtual nics must be synthetic nics, not emulated
In hyper-v manager, the virtual nics must have Enable virtual network optimizations turned on
Rss and tcp offload will automatically be turned on in the guest now

edited Sep 28 '12 at 17:33

answered Sep 28 '12 at 17:25

longneck

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This was my guess and it looks like a promising solution. I will give it a try and let you know. – H A Sep 28 '12 at 18:34
Some research brought me to this page. You can check if your host's physical adapters are even capable of RSS with Get-SmbServerNetworkInterface. If they're not capable of RSS and you're already running the best drivers for them, then you're out of luck. – Ryan Ries Nov 10 '12 at 18:10
@Ryan I ran the cmdlet you mentioned. It shows RSS capable false. See screenshot in the update above. – H A Jun 12 '13 at 21:14

score 2 · Answer 2 · answered Nov 21 '15 at 11:59

2

Enable on all adapters

    PS C:\> Enable-NetAdapterRss –Name *

Source: https://technet.microsoft.com/en-us/library/jj130859(v=wps.630).aspx

answered Nov 21 '15 at 11:59

Carlo

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score 0 · Answer 3 · answered Sep 28 '12 at 16:53

0

For RSS you can run the following from a command prompt:

netsh int tcp set global rss=disabled

answered Sep 28 '12 at 16:53

joeqwerty

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I did run this command (netsh interface tcp set global rss=enabled) because I want to enable rss. The output is **OK**. BPA still complains that I need to enable rss for the network adapter. – H A Sep 28 '12 at 18:00

score 0 · Answer 4 · answered Nov 02 '18 at 14:15

For anyone looking for the answer, in Hyper-V if you only assign a single vCPU to a VM RSS and TOv2 are not presented to the guest OS via the virtual NIC adapter (for obvious reasons).

So if TO is working correctly in other VMs then you can get rid of the BPA warnings by adding more vCPU cores to the guest OS. I would recommend that you ignore it however, as it is inefficient to assign more then 1 core to a VM that does not need it.

Enabling Receive Side Scaling & IPsec Task Offload v2 on a Network Adapter

4 Answers4