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Re: [Qemu-discuss] qemu-system_x86_64 CPU pinning

From: Rapelly, Varun
Subject: Re: [Qemu-discuss] qemu-system_x86_64 CPU pinning
Date: Tue, 2 Feb 2016 08:09:15 +0000

Hi Ravi,


Yet to test the patch. Will let you know the result.


From: Bhattiprolu RaviKumar [mailto:address@hidden
Sent: Tuesday, February 02, 2016 12:42 PM
To: alex3kov <address@hidden>
Cc: Rapelly, Varun <address@hidden>; address@hidden
Subject: Re: [Qemu-discuss] qemu-system_x86_64 CPU pinning


Alex, Varun,

  Did the patch work for you? If you have done any improvements, can you please share the same?




On Thu, Jan 21, 2016 at 10:18 PM, Bhattiprolu RaviKumar <address@hidden> wrote:


  Attached is the patch over qemu-2.4.1. I have tested this on Centos7.1 with CentOS VMs using KVM. I am not sure how it effects other platforms.

It adds a new parameter "-vcpu" to command line. The usage example is " -vcpu 0,affinity=20" (pin VCPU 0 to CPU ID 20). Please see if it helps you.




On Thu, Jan 21, 2016 at 3:56 PM, alex3kov <address@hidden> wrote:

I'm interested in that as well. Would you mind proposing your patch upstream?



---- On Thu, 21 Jan 2016 13:09:28 +0400 Bhattiprolu RaviKumar <address@hidden>wrote ----



    I also have a similar requirement. I had patched the code over qemu 2.4.1 to add extra options to pin a VCPU to a physical CPU. I am not sure why this option is not there in qemu. (or I am not aware). If you use the taskset all the VCPU threads are getting same mask.


If you are interested, I can post the patch above qemu 2.4.1






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