linux-kernel - Re: CFQ I/O scheduler better than AS?

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Message-Id: <1285169160.10774.317.camel@albahaca.inf.um.es>
Date:	Wed, 22 Sep 2010 17:26:00 +0200
From:	Juan PC <piernas@...ec.um.es>
To:	diegocg@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: CFQ I/O scheduler better than AS?

Hi Diego,

El mié, 22-09-2010 a las 14:10 +0200, Diego Calleja escribió:
> On Miércoles, 22 de Septiembre de 2010 12:55:08 Juan PC escribió:
> > Hi:
> > 
> > I am sure that, for most people, the clear answer is "yes" (after all,
> > CFQ is the default I/O scheduler in Linux), but we are having serious
> > difficulties to find a benchmark which shows that CFQ is undoubtedly
> > better than AS.
> 
> The AS io scheduler was removed in 2.6.33 (7 months ago, in commit 
> 492af6350a5ccf087e4964104a276ed358811458), so you must be running
> benchmarks in old kernels. The CFQ scheduler used in recent kernels
> should have good performance (if it doesn't, you probably should
> write a bug report ccing jens.axboe@...cle.com)
> 
Well, 2.6.30/31 are not so old ;-)

However, this fact reinforces my question. I guess that AS was removed
due to a good reason, probably, some benchmark results. If so, those are
the benchmarks I am looking for. Do you know their names?

Thanks in advance!

	Juan

PD: BTW, congratulations for your D'Oh blog ;-)

> Saludos ;)
-- 
D. Juan Piernas Cánovas
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34868887657    Fax: +34868884151
email: piernas@...ec.um.es
PGP public key:
http://pgp.rediris.es:11371/pks/lookup?search=piernas%
40ditec.um.es&op=index

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