From: Andreas Dilger <adilger@turbolabs.com>
Date: Thu, 18 Oct 2001 09:06:46 -0600
To: linux-kernel@vger.kernel.org, forming@home.com
Subject: Re: Fwd: VM testing with mtest, 2.4.12-ac3, 2.4.12-ac3+riel's patches, and 2.4.13aa1
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On Oct 18, 2001  01:51 -0500, Josh McKinney wrote:
> This is a report of the mtest01 scripts posted by rwhron@earthlink.net
> a day orso ago.
> 
> The numbers are rather interesting.  While the latency of the ac kernels is
> definitely better, the song only dropped out for a second or two in the
> begining but that was it.  The aa kernel drops out more frequently throughout
> the test, but the amount of memory allocated is almost twice as much as with
> the ac kernels.

-ac kernel:
> Averages for 10 mtest01 runs
> bytes allocated:                    134427443.2
> User time (seconds):                2.546
> System time (seconds):              1.370
> Elapsed (wall clock) time:          4.798
> Percent of CPU this job got:        89.1%
> Major (requiring I/O) page faults:  103.8
> Minor (reclaiming a frame) faults:  32702

-ac kernel + Rik's patches:
> Averages for 10 mtest01 runs
> bytes allocated:                    124885401.6
> User time (seconds):                2.380
> System time (seconds):              1.253
> Elapsed (wall clock) time:          4.401
> Percent of CPU this job got:        89.1%
> Major (requiring I/O) page faults:  100.2
> Minor (reclaiming a frame) faults:  30363.3

Linus kernel:
> Averages for 10 mtest01 runs
> bytes allocated:                    288148684.8
> User time (seconds):                5.496
> System time (seconds):              3.003
> Elapsed (wall clock) time:          12.250
> Percent of CPU this job got:        68.9%
> Major (requiring I/O) page faults:  103.5
> Minor (reclaiming a frame) faults:  70380.6

Note that the Linus kernel has allocated twice as much memory.  What does that
mean exactly?  The user/system/wall time is also twice as high.  Somehow I
don't think you are having an equal test.

Cheers, Andreas
--
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert

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