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List: libvirt-users
Subject: Re: [libvirt-users] What global_quota option mean? What's its logic?
From: Thiago Oliveira <cpv.thiago () gmail ! com>
Date: 2017-11-03 23:35:54
Message-ID: CAB0UdF18diOe_pApMuTeNy2jJrE_zTvDdv=BK54nOabLhYioVA () mail ! gmail ! com
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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@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@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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>
[Attachment #3 (text/html)]
<div dir="ltr">Very interesting!<div>I did this configuration and I can see my core \
working just in 25%.</div><div>I would like to try the same with memory.....I am \
looking for that.</div><div><br></div><div>Thanks.</div></div><div \
class="gmail_extra"><br><div class="gmail_quote">2017-11-02 13:58 GMT-02:00 Ján \
Tomko <span dir="ltr"><<a href="mailto:jtomko@redhat.com" \
target="_blank">jtomko@redhat.com</a>></span>:<br><blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Thu, Nov 02, \
2017 at 03:03:56PM +0200, Volo M. wrote:<br> <blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi techs,<br>
<br>
Could you please explain or refer me to documentation where I could find a<br>
description of global_quota schedinfo option. Someone told me that it could<br>
mean a cpu limitation in percents like:<br>
global_quota : 25000 (does it mean cpu limit % set to 25 ?)<br>
<br>
</blockquote>
<br>
The _quota values are relative to the _period, both in milliseconds and refer<br>
to the cumulative CPU time available to all the processes/threads in a group.<br>
<br>
See the documentation in the kernel:<br>
<a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/scheduler/sched-bwc.txt" \
rel="noreferrer" target="_blank">https://git.kernel.org/pub/scm<wbr>/linux/kernel/git/torvalds/lin<wbr>ux.git/tree/Documentation/sche<wbr>duler/sched-bwc.txt</a><br>
<br>
So with global_period being set to 100000, a value of 25000 would mean<br>
that all the threads of the virtual machine would be limited to use at<br>
most 25 % of 1 CPU.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> Is it true?<br>
What other parameters mean in below output?<br>
I didn't find any related documentation at <a href="http://libvirt.org" \
rel="noreferrer" target="_blank">libvirt.org</a>.<br> Could you help me to describe \
me or refer to some description what below<br> schedinfo options mean? Thanks.<br>
<br>
</blockquote>
<br>
[...]<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> <br>
[root@cpkvm ~]# virsh schedinfo 3 --set global_quota=25<br>
<br>
Scheduler : posix<br>
<br>
error: invalid argument: value of 'global_quota' is out of range [1000,<br>
18446744073709551]<br>
<br>
[1000, 18446744073709551] - what this range mean?<br>
<br>
</blockquote>
<br>
These are the minimum and maximum values that were accepted by the<br>
kernel at the time when this error message was implemented in libvirt.<br>
<br>
Jan<br>
<br>______________________________<wbr>_________________<br>
libvirt-users mailing list<br>
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<a href="https://www.redhat.com/mailman/listinfo/libvirt-users" rel="noreferrer" \
target="_blank">https://www.redhat.com/<wbr>mailman/listinfo/libvirt-users</a><br></blockquote></div><br></div>
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