From: Andrew Morton <akpm@osdl.org>
To: Kirk True <kirk@movaris.com>
Cc: kernelnewbies@nl.linux.org, Linux-MM@kvack.org
Subject: Re: LTP VM test slower under 2.6.3 than 2.4.20
Date: Tue, 24 Feb 2004 15:38:58 -0800 [thread overview]
Message-ID: <20040224153858.77692658.akpm@osdl.org> (raw)
In-Reply-To: <403B6905.2010505@movaris.com>
Kirk True <kirk@movaris.com> wrote:
>
> I just upgraded to 2.6.3-mm2 but am still seeing a factor of two speed
> slowdown between 2.4.20 and 2.6.3-mm2 for both sequential and random
> memory accesses into 1024 MB allocated from malloc.
2.6 VM has problems, but is usually OK for single-task stuff.
You'd need to tell us a lot about your machine, and provide sufficient
information for others to reproduce what you're seeing.
And run some other tests to verify that your disk system is achieving the
same bandwidth under both kernels. Not `hdparm -t' please, it is crap.
Something like
time (dd if=/dev/zero of=/mnt/x/foo bs=1M count=2000 ; sync)
umount /mnt/x
mount /mnt/x
time dd if=/mnt/x/foo of=/dev/null bs=1M
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prev parent reply other threads:[~2004-02-24 23:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-20 16:36 Kirk True
2004-02-20 16:39 ` Martin J. Bligh
2004-02-20 18:57 ` Kirk True
2004-02-20 19:03 ` Kirk True
[not found] ` <40363DEE.9040608@movaris.com>
[not found] ` <5760000.1077296989@[10.10.2.4]>
2004-02-22 15:32 ` Kirk True
2004-02-20 22:45 ` Nick Piggin
2004-02-21 2:50 ` Kirk True
2004-02-21 2:50 ` Kirk True
2004-02-21 15:39 ` Kirk True
2004-02-23 7:19 ` Andrew Morton
2004-02-23 16:51 ` Kirk True
2004-02-23 19:42 ` Andrew Morton
2004-02-24 15:08 ` Kirk True
2004-02-24 23:38 ` Andrew Morton [this message]
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