Re: CFQ I/O scheduler better than AS?

[Juan PC]

Hi Diego,

El miÃ, 22-09-2010 a las 14:10 +0200, Diego Calleja escribiÃ:
> On MiÃrcoles, 22 de Septiembre de 2010 12:55:08 Juan PC escribiÃ:
> > 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@xxxxxxxxxx)
> 
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 CÃnovas
Departamento de IngenierÃa y TecnologÃa de Computadores
Facultad de InformÃtica. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34868887657    Fax: +34868884151
email: piernas@xxxxxxxxxxx
PGP public key:
http://pgp.rediris.es:11371/pks/lookup?search=piernas%
40ditec.um.es&op=index

*** Por favor, envÃeme sus documentos en formato texto, HTML, PDF o
PostScript :-) ***
You have new mail in /var/spool/mail/piernas


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/