Re: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 12/9/08 03:22, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

>> I consider this might be a nice win for possibly less effort than is
> being
>> expended in trying to make idle residency times (and hence Cx
> residency
>> times) as long as possible.
>> 
> 
> These two don't conflict. Cpu online/offline can't be used in small
> interval due
> to long latency and added overhead to whole system, but it makes sense
> when administrator realizes low cpu utilization in a relatively long
> period like
> in hrs. Current idle governor instead runs in fine-grained level to fit
> the otherwise
> cases.

I certainly agree with that. Just pointing out that, with the fine-graiend
approach, beyond a certain point you'll be investing effort for smaller and
smaller further gains.

 -- Keir



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