linux-kernel - Re: [patch v4 0/18] sched: simplified fork, release load avg and power awareness scheduling

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Date:	Mon, 28 Jan 2013 08:33:04 +0100
From:	Mike Galbraith <efault@....de>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Borislav Petkov <bp@...en8.de>, torvalds@...ux-foundation.org,
	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	namhyung@...nel.org, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v4 0/18] sched: simplified fork, release load avg and
 power awareness scheduling

On Mon, 2013-01-28 at 15:17 +0800, Alex Shi wrote: 
> On 01/28/2013 02:49 PM, Mike Galbraith wrote:
> > On Mon, 2013-01-28 at 13:19 +0800, Alex Shi wrote: 
> >> On 01/27/2013 06:40 PM, Borislav Petkov wrote:
> >>> On Sun, Jan 27, 2013 at 10:41:40AM +0800, Alex Shi wrote:
> >>>> Just rerun some benchmarks: kbuild, specjbb2005, oltp, tbench, aim9,
> >>>> hackbench, fileio-cfq of sysbench, dbench, aiostress, multhreads
> >>>> loopback netperf. on my core2, nhm, wsm, snb, platforms. no clear
> >>>> performance change found.
> >>>
> >>> Ok, good, You could put that in one of the commit messages so that it is
> >>> there and people know that this patchset doesn't cause perf regressions
> >>> with the bunch of benchmarks.
> >>>
> >>>> I also tested balance policy/powersaving policy with above benchmark,
> >>>> found, the specjbb2005 drop much 30~50% on both of policy whenever
> >>>> with openjdk or jrockit. and hackbench drops a lots with powersaving
> >>>> policy on snb 4 sockets platforms. others has no clear change.
> >>>
> >>> I guess this is expected because there has to be some performance hit
> >>> when saving power...
> >>>
> >>
> >> BTW, I had tested the v3 version based on sched numa -- on tip/master.
> >> The specjbb just has about 5~7% dropping on balance/powersaving policy.
> >> The power scheduling done after the numa scheduling logical.
> > 
> > That makes sense.  How the numa scheduling numbers compare to mainline?
> > Do you have all three available, mainline, and tip w. w/o powersaving
> > policy?
> > 
> 
> I once caught 20~40% performance increasing on sched numa VS mainline
> 3.7-rc5. but have no baseline to compare balance/powersaving performance
> since lower data are acceptable for balance/powersaving and
> tip/master changes too quickly to follow up at that time.
> :)

(wow.  dram sucks, dram+smp sucks more, dram+smp+numa _sucks rocks_;)

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