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Message-ID: <5a4c581d0604111111s4946b39x3686ade1275ded90@mail.gmail.com>
Date: Tue, 11 Apr 2006 20:11:55 +0200
From: "Alessandro Suardi" <alessandro.suardi@gmail.com>
To: "Andreas Mohr" <andi@rhlx01.fht-esslingen.de>
Subject: Re: 40% IDE performance regression going from FC3 to FC5 with same kernel
Cc: "Linux Kernel" <linux-kernel@vger.kernel.org>
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On 4/11/06, Andreas Mohr <andi@rhlx01.fht-esslingen.de> wrote:
> Hi,
>
> On Sat, Apr 08, 2006 at 04:47:18PM +0200, Alessandro Suardi wrote:
> > I'll be filing a FC5 performance bug for this but would like an opinion
> >  from the IDE kernel people just in case this has already been seen...
> >
> > I just upgraded my home K7-800, 512MB RAM box from FC3 to FC5
> >  and noticed a disk performance slowdown while copying files around.
>
> Just another suggestion: try eliminating/pinpointing I/O scheduler issues
> (switch e.g. to "noop" at /sys/block/hda/queue/scheduler and compare again)

Thanks Andi. Tried every scheduler (my default is anticipatory) and
 there aren't meaningful differences - 18.3 to 18.6MB/s.

As a further data point, my box can burn a 8x DVD+R at up to 7.1x
 average speed under FC3, while it barely keeps up with 4x in FC5.

--alessandro

 "Dreamer ? Each one of us is a dreamer. We just push it down deep because
   we are repeatedly told that we are not allowed to dream in real life"
     (Reinhold Ziegler)