Re: [libvirt-users] Hard limit for the cpu usage of a VM
On 10/24/2011 02:54 PM, sethuraman subbiah wrote:
[root@sbc11 ssubbiah]# virsh schedinfo rubis_ws --set vcpu_quota=50
Scheduler : posix
error: invalid scheduler option: vcpu_quota=50
I get the same error for "virsh schedinfo rubies_ws --set vcpu_quota 50" .
I find that my version is 0.9.4.
[root@sbc11 ssubbiah]# virsh --version
0.9.4
Should I do some modifications,enable options or add some patch to get the capability to
set cap ? Thanks for all your help.
I found this comment in the code:
/* If we does not know VCPU<->PID mapping or all vcpu runs in the same
* thread, we cannot control each vcpu. So we only modify cpu bandwidth
* when each vcpu has a separated thread.
I think that means that in order to use CPU caps, you have to also use
<vcpupin> to call out the host CPU pinning to be used by the guest VCPUS.
The original implementation was here, although I don't see much
documentation in that patch series.
https://www.redhat.com/archives/libvir-list/2011-July/msg01389.html
Wen, can you help out here?
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org