Re: [libvirt-users] Hard limit for the cpu usage of a VM
On 10/24/2011 02:39 PM, sethuraman subbiah wrote:
Hi,
On Oct 24, 2011, at 4:30 PM, Eric Blake wrote:
> On 10/24/2011 02:24 PM, sethuraman subbiah wrote:
>> Great, I have one more question. Is it possible to set the quota during run time
from the host os ? Using virsh ? Thank you.
>
> virsh schedinfo can both query and alter these cpu tunables, and that includes doing
it while the guest is running.
>
I tried the virsh schedinfo. Here is the information regarding my libvirt :
[root@sbc11 ssubbiah]# virsh version
Compiled against library: libvir 0.9.4
Using library: libvir 0.9.4
Using API: QEMU 0.9.4
Running hypervisor: QEMU 0.12.1
When i use "[root@hgcc11 ssubbiah]# virsh schedinfo rubis_ws --cap 50" , I dont
see the cap value being set and I am able to see only cpu shares.
schedinfo --cap is obsolete (it's xen-only). Rather, you want:
virsh schedinfo domain
to list the current settings, and
virsh schedinfo domain --set vcpu_period $value --set vcpu_quota $value
I haven't used it myself; I'm only going off the documentation provided
by Wen Congyang, who oversaw the addition of the features.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org