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Date: Sat, 30 Nov 2002 14:15:43 -0800
From: Andrew Morton <akpm@digeo.com>
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To: "J.A. Magallon" <jamagallon@able.es>
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Subject: Re: [PATCHSET] Linux 2.4.20-jam0
References: <20021129233807.GA1610@werewolf.able.es> <3DE80AB6.611F3A8C@digeo.com> <20021130144541.GA2517@werewolf.able.es>
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"J.A. Magallon" wrote:
> 
> On 2002.11.30 Andrew Morton wrote:
> >"J.A. Magallon" wrote:
> >>
> >> - Orlov inode allocator for 2.4
> >
> >The Orlov allocator in 2.5 has caused a tremendous performance regression
> >in dbench-on-ext3/ordered-on-scsi.
> >
> >I don't know why yet - I doubt if it's due to the allocator itself - more
> >likely an IO scheduling bug in ext3, or a bug in the 2.5 elevator.
> >
> >There is no such regression on IDE - presumably write caching is covering
> >up the problem.
> >
> 
> Is there any way I can test that ? I have all scsi drives and can
> for example remount with 'orlov' or 'oldalloc'...

It is specific to SMP, and for some reason doesn't manifest with
IDE hardware.

See
http://sourceforge.net/mailarchive/forum.php?thread_id=1365460&forum_id=6379
for the analysis.
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