linux-kernel - Re: [RFC PATCH] sched: Pass affine target cpu into wake

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Date:	Fri, 08 Jan 2010 04:34:29 +0100
From:	Mike Galbraith <efault@....de>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [RFC PATCH] sched: Pass affine target cpu into wake_affine

On Fri, 2010-01-08 at 10:38 +0800, Lin Ming wrote:
> On Thu, 2010-01-07 at 21:14 +0800, Mike Galbraith wrote:

> > Below is a complete retest.  Mind testing my hacklet?  I bet a nickle
> > it'll work at least as well as yours on your beefy boxen.
> 
> I tested your hacklet on below 2 machines as before.
> 
> Tigerton x86_64 machine: 16cpus(4P/4Cores), 40G mem
> IA64 machine: 32cpus(4P/4Cores/HT), 16G mem
> 
> Test1: vmark regression fix patch + pass affine target
> Test2: this hacklet
> 
> Compared with upstream 2.6.33-rc2, 
> Test1: Tigerton +3%, IA64 +15%
> Test2: Tigerton +3%, IA64 +10%
> 
> The test2 also improves on IA64, although not as good as test1.

Dang, I owe you a nickle.  Thanks a bunch for giving it a go.

Interesting result.  It's not really making much sense why you see a
peak gain, while I see peak loss.  Radical behavior difference :-/

I think the ramp only (and harder) approach is safer, but we'll see.

	-Mike

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