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From: Daniel Phillips <phillips@bonn-fries.net>
To: Andrew Morton <akpm@zip.com.au>
Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
Date: Wed, 9 Jan 2002 10:48:03 +0100
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Cc: Anton Blanchard <anton@samba.org>, Andrea Arcangeli <andrea@suse.de>,
        Luigi Genoni <kernel@Expansa.sns.it>,
        Dieter N?tzel <Dieter.Nuetzel@hamburg.de>,
        Marcelo Tosatti <marcelo@conectiva.com.br>,
        Rik van Riel <riel@conectiva.com.br>,
        Linux Kernel List <linux-kernel@vger.kernel.org>,
        Robert Love <rml@tech9.net>
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On January 9, 2002 10:26 am, Andrew Morton wrote:
> Daniel Phillips wrote:
> > By the way, did you check for latency in directory operations?
> 
> Yes.  They can be very bad for really large directories.  Scheduling
> on the found-in-cache case in bread() kills that one easily for most
> local filesystems.  There may still be a problem in ext2.

A indexed directory won't have that problem - I'll get to finishing off the 
htree patch pretty soon[1].  In any event, the analogous technique will work: 
a schedule point in ext2_bread.

[1] Wli's hash work is happening at a convenient time.

--
Daniel
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