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From: Grant Grundler <grundler@parisc-linux.org>
To: Joel Soete <soete.joel@tiscali.be>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] clerar user page test
Date: Thu, 9 Dec 2004 10:32:39 -0700	[thread overview]
Message-ID: <20041209173239.GA14560@colo.lackof.org> (raw)
In-Reply-To: <418A81310000D172@mail-7-bnl.tiscali.it>

On Tue, Dec 07, 2004 at 03:12:37PM +0100, Joel Soete wrote:
> here are the results of some clup test:
...

Joel,
I also rewrote the test and parked it on:
	http://iou.parisc-linux.org/hppa/clup.c

Here's the output from a a500-6x running 2.6.10-rc1-pa12-SMP:
grundler@iodine:~$ gcc-3.3 -o clup0 clup.c
grundler@iodine:~$ gcc-3.3 -DLOOP2X -o clup1 clup.c
grundler@iodine:~$ gcc-3.3 -march=2.0 -DLP64 -o clup2 clup.c
grundler@iodine:~$ gcc-3.3 -march=2.0 -DLP64 -DLOOP2X -o clup3 clup.c
grundler@iodine:~$ gcc-3.3 -march=2.0 -DLP64 -DLOOP2X -DPREFETCH -o clup4 clup.c
grundler@iodine:~$ for i in 0 1 2 3 4; do time ./clup$i ; done 2>&1 | fgrep user 
user    0m2.393s
user    0m2.392s
user    0m1.238s
user    0m1.224s
user    0m1.225s

I've varied the prefetch values and nothing seems to be helping.
I have to wonder if it's because the kernel VM is interferring
with the test.

But doubling the stride for 64-bit is consistently ~1.8% improvement.

grant
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  parent reply	other threads:[~2004-12-09 17:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-12-07 14:12 [parisc-linux] clerar user page test Joel Soete
2004-12-09  7:42 ` Grant Grundler
2004-12-09 17:32 ` Grant Grundler [this message]
2004-12-09 18:31   ` Joel Soete

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