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Date: Thu, 18 Dec 2003 11:41:11 -0200 (BRST)
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
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To: Martin Knoblauch <knobi@knobisoft.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: RAID-0 read perf. decrease after 2.4.20
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On Tue, 16 Dec 2003, Martin Knoblauch wrote:

> On Monday 08 December 2003 13:47, Marcelo Tosatti wrote:
> 
> Hi Marcelo,
> 
> > 2.4.20-aa included rmap and some VM modifications most notably
> > "drop_behind()" logic which I believe should be the reason for the
> huge
> > read speedups. Can you please try it? Against 2.4.23.
> 
>  Just some feedback:
> 
> echo 511 > /proc/sys/vm/max-readahead
> 
>  brings back the read performance of my 30 disks on 4 controller
> LVM/RAID0.

Great.