Re: [Xen-users] CPU cap and weight

[Andrew Son <mailing.son@xxxxxxxxx>]

Hi Peter,

Thank for references.
My detailed question is:

If the host machine is not busy, guest VM can get VCPU (timeslices) in
every 30ms.
If the CAP value is 50, does guest VM get 15ms?
or guest VM can get 30ms, but it can not use 15ms?


2013/2/18 Peter Viskup <skupko.sk@xxxxxxxxx>:
> On 02/18/2013 01:34 AM, Andrew Son wrote:
>>
>> The guest VM suffers from steel time meaning guest vm can not get cpu
>> cycles. Does this mean other guest vm can obtain cpu cycles or just
>> waste my own cpu cycles?
>
> Hi Andrew,
> the steal time is here since Linux kernel 2.6.11 [1].
> Of course, other guests can obtain cpu cycles from the backing CPU of that
> vCPU. Read more about Xen credit scheduler (Xen's default) [2].
>
> [1] http://lwn.net/Articles/108605/
> [2] http://wiki.xen.org/wiki/Credit_Scheduler
>
> --
> Peter Viskup

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