From: Al Boldi <a1426z@gawab.com>
To: Marr <marr@flex.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Readahead value 128K? (was Re: Drastic Slowdown of 'fseek()'
Date: Mon, 13 Mar 2006 14:37:50 +0300 [thread overview]
Message-ID: <200603131437.50461.a1426z@gawab.com> (raw)
Marr wrote:
> The 2.6.13 kernel on ReiserFS (without using
> 'nolargeio=1' as a mount option) still takes about 4m35s to fseek 200,000
> times on that 4MB file, even with 'hdparm -a0 /dev/hda' in effect.
try this magic number:
echo 192 > /sys/block/hda/queue/max_sectors_kb
echo 192 > /sys/block/hda/queue/read_ahead_kb
Anything outside 132-255 affects throughput negatively.
Also, can you dump hdparm -I /dev/hda?
Thanks!
--
Al
next reply other threads:[~2006-03-13 11:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-13 11:37 Al Boldi [this message]
2006-03-13 20:01 ` Marr
2006-03-26 22:25 ` Marr
2006-03-27 18:50 ` Hans Reiser
2006-03-27 19:12 ` Marr
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