Re: Hard limit for the cpu usage of a VM

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On 10/24/2011 01:50 PM, sethuraman subbiah wrote:
Hi ,

I was previously using xen and currently moved to KVM. I am using libvirt to manage these VMs. In den's credit scheduler , I had the ability to set a cap on the cpu usage for a VM. But I was not able to find a similar substitute in KVM. I find that we can use cgroups to provide shares for VM but that will be more like weight based and it doesn't set a hard cap for that VM. I tried using cpulimit but I find it inaccurate and we can give values only between 0-100. Thus, I think it cannot support multi core environments. Can any one suggest a method to set a hard limit on a VM's cpu usage? Thank you.

Libvirt 0.9.4 added CPU bandwidth limitation support, via <cputune>: http://libvirt.org/formatdomain.html#elementsCPUTuning. <period> and <quota> map to hard-coded caps via cgroups, nicer than the weighted numbers via <shares>.

--
Eric Blake   eblake@xxxxxxxxxx    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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