[libvirt-users] Hard limit for the cpu usage of a VM

[sethuraman subbiah]

On Oct 24, 2011, at 4:46 PM, Eric Blake wrote:

> On 10/24/2011 02:39 PM, sethuraman subbiah wrote:
>> Hi,
>> 
>> 
>> 
>> When i use "[root at 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 schedinfo --cap is obsolete (it's xen-only).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.

Sorry, I noticed it late about using a xen command here. I tried virsh schedinfo domain. I dont think I have the capability to set quota : 

[root at sbc11 ssubbiah]# virsh schedinfo rubis_ws
Scheduler      : posix
cpu_shares     : 1024

[root at 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 at 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. 
 

> 
> -- 
> Eric Blake   eblake at redhat.com    +1-801-349-2682
> Libvirt virtualization library http://libvirt.org