Re: [Xen-devel] [Patch 2 of 2]: PV-domain SMP performance Linux-part

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 19/12/2008 09:33, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 19.12.08 10:10 >>>
>> I haven't seen any win on any real world setup. So I remain unconvinced, and
>> it'll need more than you alone championing the patch to get it in. There
>> have been no other general comments so far (Jan's have been about specific
>> details).
> 
> I think I'd generally welcome a change like this, but I'm not certain how far
> I feel convinced that the submission meets one very basic criteria:
> avoidance of mis-use of the feature by a domain (simply stating that a vCPU
> will be de-scheduled after 1ms anyway doesn't seem sufficient to me). This
> might need to include ways to differentiate between Dom0/DomU and/or
> CPU- vs IO-bound vCPU-s.

The most likely person to comment on that in the coming weeks would be
George, who's kindly signed up to do some design work on the scheduler.

 -- Keir



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