Messages in this thread | | | From | Michael Neuling <> | Subject | Re: [PATCH 1/5] sched: fix capacity calculations for SMT4 | Date | Tue, 20 Apr 2010 06:45:45 +1000 |
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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
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