Re: [ckrm-tech] Re: [PATCH 0/9] CPU controller

[Kirill Korotaev]

> > > I'm also pretty sure, that CPU controller based on timeslice tricks 
> > > behaves poorly on burstable load patterns as well and with interactive 
> > > tasks. So before commiting I propose to perform a good testing on 
> > > different load patterns.
> >
> > Yes, it can only react very slowly.
>
>
> Actually, this might not be that much of a problem.  I know I can
> traverse queue heads periodically very cheaply.  Traversing both active
> and expired arrays to requeue starving tasks once every 100ms costs max
> 4usecs (3GHz P4) for a typical distribution.

with fair scheduling with can be a big problem, as tasks working less 
then a tick are hard to account :/

Thanks,
Kirill


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