PreferredNode of a service not working anymore using WS2022

Question

Hello,

I was using the preferredNode attribute for services (sc preferredNode <ServiceName> #Node) in the past to set the initial Numa node memory and cpu affinity.

Since I switched to Windows Server 2022 (OS Build 20348.1249) the cpu affinity is not working anymore. The underlying executable is always pinned to Node 0.

I double checked the behavior on a WS2019 instance, there it works fine, setting preferredNode to 1 starts the executable with cpu affinity at Node 1.

Anyone facing the same problem and found a solution?

Thanks

Matthias

Answer 1

Hello Wesley,

thanks for your reply. I was already aware about the changes regarding NUMA with this build.
Unfortunately I am not recoding an application to make use of the new functionalities, I want to use existing tools like start.exe, sc etc. to configure NUMA affinity.
Is there a way to set the affinity via powershell or command line instead of selecting the process via task manager and setting the affinity manually?

Thanks and cheers
Matthias

Answer 2

Hello.

Starting with windows 10 Build 20348, NUMA support has changed, see if this event helps your problem:

https://learn.microsoft.com/en-us/windows/win32/procthread/numa-support

Answer 3

Hello Wesley,

thanks for your reply.
Unfortunately there are no logs showing the issue.

I create some screenshots to show you the issue I am facing.

• How I set the preferredNode for my service

• Start service

• check affinity

As said... using the same procedure on versions < WS2022 works fine.
The server has 8 Numa Nodes.

Any help appreciated.

Thanks and cheers
Matthias