linux-kernel - Re: [announce] CFS-devel, performance improvements

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Date:	Thu, 13 Sep 2007 04:42:22 -0400
From:	"Rob Hussey" <robjhussey@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Mike Galbraith" <efault@....de>,
	"Roman Zippel" <zippel@...ux-m68k.org>
Subject: Re: [announce] CFS-devel, performance improvements

On 9/11/07, Rob Hussey <robjhussey@...il.com> wrote:
> Hi Ingo,
>
> When compiling, I get:

Yeah, this was my fault :(

I've had a chance to test this now, and everything feels great. I did
some benchmarks for 2.6.23-rc1, 2.6.23-rc6-cfs, and
2.6.23-rc6-cfs-devel:
lat_ctx -s 0 2:
2.6.23-rc1	2.6.23-rc6-cfs	2.6.23-rc6-cfs-devel
   5.15		   4.91			5.05
   5.23		   5.18			4.85
   5.19		   4.89			5.17
   5.36		   5.23			4.86
   5.35		   5.00			5.13
   5.34		   5.05			5.12
   5.26		   4.99			5.06
   5.11		   5.04 		4.96
   5.29		   5.19		  	5.18
   5.40		   4.93		   	5.07

hackbench 50:
     2.6.23-rc1	2.6.23-rc6-cfs	2.6.23-rc6-cfs-devel
	6.301 		5.963 		5.837
	6.417		5.961 		5.814
	6.468 		5.965 		5.757
	6.525 		5.926 		5.840
	6.320 		5.929 		5.751
	6.457 		5.909		5.825

pipe-test (http://redhat.com/~mingo/cfs-scheduler/tools/pipe-test.c):
     2.6.23-rc1	 2.6.23-rc6-cfs	2.6.23-rc6-cfs-devel
	14.29		14.03		13.89
	14.31		14.01		14.10
	14.27		13.99		14.15
	14.31		14.02		14.16
	14.53		14.02		14.14
	14.53		14.27		14.16
	14.51		14.36		14.12
	14.48		14.33		14.16
	14.52		14.36		14.17
	14.47		14.36		14.15

I turned the results into graphs as well. I'll attach them, but they're also at:
http://www.healthcarelinen.com/misc/lat_ctx_benchmark.png
http://www.healthcarelinen.com/misc/hackbench_benchmark.png
http://www.healthcarelinen.com/misc/pipe-test_benchmark.png

The hackbench and pipe-test numbers are very encouraging. The avg
between the 2.6.23-rc6-cfs and 2.6.23-rc6-cfs-devel lat_ctx numbers
are nearly identical (5.041 and 5.045 respectively).

Download attachment "lat_ctx_benchmark.png" of type "image/png" (6777 bytes)

Download attachment "hackbench_benchmark.png" of type "image/png" (4152 bytes)

Download attachment "pipe-test_benchmark.png" of type "image/png" (4856 bytes)