Ops, missed this one. It works like a charm. Now I feel like I'm trying to reinvent the wheel. It's a lot simpler working directly with libvirt.
Thanks a lot for you help. On Fri, May 11, 2012 at 7:04 PM, Eric Blake <[email protected]> wrote: > On 05/11/2012 03:51 PM, Antonio Carlos Salzvedel Furtado Junior wrote: > > Thanks for the prompt response, it cleared a lot of my doubts > > > > Actually, I could enable the other controllers. It's just that I have a > > strong reason to use the cpu controller. > > I need to set a hard limit for CPU consumption. Maybe 'cpu.shares' was a > > bad example. > > I'm working especially with two parameters, "cpu.cfs_period_us" and > > "cpu.cfs_quota_us". For instance, sometimes I need to limit my VM to 20% > of > > the CPU share, regardless of the CPU load. Then I set > > "cpu.cfs_period_us=100000" and "cpu.cfs_quota_us=20000". > > I'm using the libcgroup API to do that, but I agree that it would be > better > > to use the libvirt API. > > > > Looking at the documentation, The parameters I'd need to change would be > > the following: > > > > <domain> > > ... > > <cputune> > > <period>100000</period> > > <quota>20000</quota> > > </cputune> > > ... > > </domain> > > > > Unfortunately, I think virsh does not have tools to change these > > parameters, as libcgroup does ( cgget and cgset ). However I guess it > won't > > be a problem, I'll try to use the libvirt API. > > virsh exposes the libvirt API; if you can't get it working in virsh, > that's a bug that we should fix. That said: > > virsh schedinfo $dom --set vcpu_period=100000 --set vcpu_quota=20000 > > should do exactly what you're asking for. > > -- > Eric Blake [email protected] +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >
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