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

[Thiago Oliveira]

Very interesting!
I did this configuration and I can see my core working just in 25%.
I would like to try the same with memory.....I am looking for that.

Thanks.

2017-11-02 13:58 GMT-02:00 Ján Tomko <jtomko at redhat.com>:

> 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 at 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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