lkml.org 
[lkml]   [2010]   [Apr]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 1/5] sched: fix capacity calculations for SMT4
Date
In message <1271688543.1488.253.camel@laptop> you wrote:
> On Mon, 2010-04-19 at 07:34 +1000, Michael Neuling wrote:
> > > Are there any numbers available on how much they gain? It might be worth
> > > to stick in real numbers instead of this alleged 15%.
> >
> > I get some gain numbers but obviously the workloads makes a huge
> > difference. From a scheduler perspective, I assume an
> > average/representative gain is best rather than an optimistic or
> > pessimistic one?
>
> Yeah, average would be best.

Ok.

> > We'll have different gains for SMT2 and SMT4, so we could change the
> > gain dynamically based on which SMT mode we are in. Does that seem like
> > something we should add as an arch hook?
>
> That's the sort of thing you can use arch_scale_smt_power() for. But be
> weary to not fall into the same trap I did with x86, where I confused
> actual gain with capacity (When idle the actual gain is 0, but the
> capacity is not).

Oops, yes of course :-)

<from before>
> Hrmm, my brain seems muddled but I might have another solution, let me
> ponder this for a bit..

Let me know if/when you come up this solution or if I can help.

Mikey


\
 
 \ /
  Last update: 2010-04-19 22:47    [W:0.048 / U:0.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site