From: William Lee Irwin III <wli@holomorphy.com>
To: Martin Schlemmer <azarah@nosferatu.za.org>
Cc: Thomas Molina <tmolina@cablespeed.com>,
Linus Torvalds <torvalds@osdl.org>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.0 performance problems
Date: Mon, 29 Dec 2003 21:09:34 -0800 [thread overview]
Message-ID: <20031230050934.GM27687@holomorphy.com> (raw)
In-Reply-To: <1072739685.25741.65.camel@nosferatu.lan>
On Tue, 2003-12-30 at 00:58, Thomas Molina wrote:
>> It certainly looks like DMA is enabled. Under 2.4 I get:
>> [root@lap root]# hdparm /dev/hda
[...]
>> readahead = 8 (on)
[...]
>> Under 2.6 I get:
>> [root@lap root]# hdparm /dev/hda
[...]
>> readahead = 256 (on)
On Tue, Dec 30, 2003 at 01:14:45AM +0200, Martin Schlemmer wrote:
> Increase your readahead:
> # hdparm -a 8192 /dev/hda
> BTW: As we really do get this question a _lot_ of times, why
> don't the ide layer automatically set a higher readahead
> if there is enough cache on the drive or something?
Could you try lowering 2.6's readahead to 2.4's levels in order to rule
out readahead-induced thrashing?
-- wli
next prev parent reply other threads:[~2003-12-30 5:09 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-29 22:07 2.6.0 performance problems Thomas Molina
2003-12-29 22:21 ` Linus Torvalds
2003-12-29 22:58 ` Thomas Molina
2003-12-29 23:04 ` Linus Torvalds
2003-12-30 14:14 ` Thomas Molina
2003-12-30 14:39 ` William Lee Irwin III
2003-12-30 21:14 ` Thomas Molina
2003-12-30 21:23 ` Linus Torvalds
2003-12-31 0:50 ` Thomas Molina
2003-12-31 1:01 ` Linus Torvalds
2003-12-31 1:34 ` Andrew Morton
2003-12-31 11:25 ` bert hubert
2003-12-30 21:35 ` William Lee Irwin III
2003-12-30 23:46 ` Roger Luethi
2003-12-30 18:20 ` Linus Torvalds
2003-12-29 23:14 ` Martin Schlemmer
2003-12-30 5:09 ` William Lee Irwin III [this message]
2003-12-30 10:27 ` Thomas Molina
2003-12-29 23:25 ` David B. Stevens
2003-12-29 23:05 ` Thomas Molina
2003-12-29 23:43 ` Martin Schlemmer
2003-12-30 0:17 ` Thomas Molina
2003-12-30 1:23 ` Martin Schlemmer
2003-12-30 1:27 ` Dave Jones
2003-12-30 1:37 ` Martin Schlemmer
2003-12-30 1:40 ` Dave Jones
2003-12-30 1:49 ` Thomas Molina
2003-12-30 2:03 ` Mike Fedyk
2004-01-03 19:37 ` Bill Davidsen
2003-12-30 1:25 ` Roger Luethi
2003-12-30 1:37 ` Thomas Molina
2003-12-30 19:21 ` Andy Isaacson
2003-12-30 19:40 ` William Lee Irwin III
2003-12-30 22:24 ` Roger Luethi
2003-12-31 0:33 ` Thomas Molina
2003-12-31 10:17 ` Roger Luethi
2003-12-31 11:21 ` Jens Axboe
2003-12-31 21:03 ` Roger Luethi
2004-01-01 1:27 ` Thomas Molina
2004-01-01 10:23 ` Roger Luethi
2004-01-01 23:09 ` Roger Luethi
2004-01-02 10:11 ` Jens Axboe
2003-12-30 1:27 ` Thomas Molina
2003-12-30 2:53 ` Thomas Molina
2003-12-30 11:41 Samium Gromoff
2004-01-03 19:54 ` Bill Davidsen
[not found] ` <200312300855.00741.edt@aei.ca>
2004-01-05 12:33 ` Samium Gromoff
2004-01-05 15:09 ` Ed Tomlinson
2004-01-06 2:23 ` David Lang
2004-01-06 14:44 ` Samium Gromoff
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