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 ebl...@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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