2:03 p.m.
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 ?)
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 list
Id Name State
----------------------------------------------------
3 kvmtestvm running
[root@cpkvm ~]# virsh schedinfo 3
Scheduler : posix
cpu_shares : 154
vcpu_period : 100000
vcpu_quota : -1
emulator_period: 100000
emulator_quota : -1
global_period : 100000
global_quota : -1
iothread_period: 100000
iothread_quota : -1
[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?
[root@cpkvm ~]#
[root@cpkvm ~]# virsh schedinfo 3 --set global_quota=25000
Scheduler : posix
cpu_shares : 154
vcpu_period : 100000
vcpu_quota : 12500
emulator_period: 100000
emulator_quota : -1
global_period : 100000
global_quota : 25000
iothread_period: 100000
iothread_quota : 25000
[root@cpkvm ~]#
4:58 p.m.
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/D...
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
12:35 a.m.
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(a)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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Ján Tomko -
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Volo M.