Re: [PATCH]O20int

[Mike Fedyk]

On Thu, Sep 04, 2003 at 08:55:45AM +1000, Con Kolivas wrote:
> On Thu, 4 Sep 2003 05:19, Mike Fedyk wrote:
> > On Thu, Sep 04, 2003 at 12:53:10AM +1000, Con Kolivas wrote:
> > > Smaller timeslice granularity for most interactive tasks and larger for
> > > less interactive. Smaller for each extra cpu.
> > >
> > > +#ifdef CONFIG_SMP
> > > +#define TIMESLICE_GRANULARITY(p) \
> > > +	(MIN_TIMESLICE * (1 << (MAX_BONUS - CURRENT_BONUS(p))) * \
> > > +		num_online_cpus())
> > > +#else
> > > +#define TIMESLICE_GRANULARITY(p) \
> > > +	(MIN_TIMESLICE * (1 << (MAX_BONUS - CURRENT_BONUS(p))))
> > > +#endif
> > > +
> >
> > Don't you want to put a max(10,TIMESLICE_GRANULARITY) in there so that the
> > time slice won't go below 1ms for large proc servers?  I'm not sure if it
> > was you, or someone else but they did some testing to see how the
> > timeslice length affected the cache warmth, and the major improvements
> > stopped after 7ms, so 10 might be a good default mimimum.
> 
> That works out to 10ms minimum.

With how many processors? 64? 128?
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