Re: [libvirt-users] What global_quota option mean? What's its logic?

On Thu, Nov 02, 2017 at 03:03:56PM +0200, Volo M. wrote: > Hi techs, > > Could you please explain or refer me to documentation where I could find a > description of global_quota schedinfo option. Someone told me that it > could > mean a cpu limitation in percents like: > global_quota : 25000 (does it mean cpu limit % set to 25 ?) > > The _quota values are relative to the _period, both in milliseconds and refer to the cumulative CPU time available to all the processes/threads in a group. See the documentation in the kernel: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin ux.git/tree/Documentation/scheduler/sched-bwc.txt So with global_period being set to 100000, a value of 25000 would mean that all the threads of the virtual machine would be limited to use at most 25 % of 1 CPU. Is it true? > What other parameters mean in below output? > I didn't find any related documentation at libvirt.org. > Could you help me to describe me or refer to some description what below > schedinfo options mean? Thanks. > > [...] > [root@cpkvm ~]# virsh schedinfo 3 --set global_quota=25 > > Scheduler : posix > > error: invalid argument: value of 'global_quota' is out of range [1000, > 18446744073709551] > > [1000, 18446744073709551] - what this range mean? > > These are the minimum and maximum values that were accepted by the kernel at the time when this error message was implemented in libvirt. Jan _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users