Re: [Xen-users] dom-0 pin or schedule high?

[Periko Support <pheriko.support@xxxxxxxxx>]

On Wed, Jul 25, 2012 at 3:21 PM, Dario Faggioli <raistlin@xxxxxxxx> wrote:
> On Tue, 2012-07-24 at 22:06 -0700, Periko Support wrote:
>> Hi Running Xen 4.1.x
>>
> Hi,
>
>> Reading about schedulers, I normally give 1-2 cores to dom-0, reading
>> about schedulers it say that we can give a dedicate core to the dom-0
>> or increase scheduler +256.
>>
>> What is the rule? can both?
>>
> Mmm... I'm not sure I've understood your question. However, the point
> is, depending on your configuration, it is possible that Dom0 will be
> performing some operation on behalf of the various DomUs. Besides than
> that, being able to access Dom0 for system maintenance purposes (such as
> killing/rebooting DomUs, etc) is something one wants to be always
> possible.
>
> For these reasons, it is often advised to act in such a way that Dom0
> gets some chances to run, independently from what the DomUs do and from
> how much load that generates. Hence those rules you're citing, which aim
> at achieving right this, although at different levels ad with different
> methods.
>
> No one of them is better than the other per-se, it really depends on
> your setup and on your workload. Finally, if you want to know if it's
> possible to do both things, i.e., reserving one or more core for Dom0
> AND boosting its scheduling priority, well, it is, but it's also a bit
> pointless. :-P
>
> Regards,
> Dario
>
> --
> <<This happens because I choose it to happen!>> (Raistlin Majere)
> -----------------------------------------------------------------
> Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
> Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
>
>

I'm working on my lab, I will run some benchmark and see what happen,
I'm on a learning curve, appreciate your info, thanks!!!

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