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/linux.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
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