Message-ID: <4415B6C0.8060405@namesys.com>
Date: Mon, 13 Mar 2006 10:15:28 -0800
From: Hans Reiser <reiser@namesys.com>
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To: Mark Lord <lkml@rtr.ca>, drepper@redhat.com
CC: Marr <marr@flex.com>, Linda Walsh <lkml@tlinx.org>,
       Bill Davidsen <davidsen@tmr.com>, linux-kernel@vger.kernel.org,
       reiserfs-dev@namesys.com, Andrew Morton <akpm@osdl.org>
Subject: Re: Readahead value 128K? (was Re: Drastic Slowdown of 'fseek()'
 Calls From 2.4 to 2.6 -- VMM Change?)
References: <200602241522.48725.marr@flex.com> <200603121653.30288.marr@flex.com> <44149D6A.7080005@rtr.ca> <200603122336.55701.marr@flex.com> <441584AD.8060503@rtr.ca>
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Ulrich, what are your plans regarding fixing this?  Are you just going
to ignore it or?

Hans

Mark Lord wrote:

> Marr wrote:
>
>>
>> Anyway, not that it really matters, but I re-did the testing with
>> '-a0' and it didn't help one iota. 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.
>
>
> Does it make a difference when done on the filesystem *partition*
> rather than the base drive?  At one time, this mattered, and it may
> still work that way today.
>
> Eg.  hdparm -a0 /dev/hda3   rather than   hdparm -a0 /dev/hda
>
> ??
>
>

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