Subject: Re: I/O priorities
To: Jason R Thorpe <thorpej@wasabisystems.com>
From: Manuel Bouyer <bouyer@antioche.lip6.fr>
List: tech-kern
Date: 06/24/2002 22:22:48
On Fri, Jun 21, 2002 at 10:13:41AM -0700, Jason R Thorpe wrote:
> On Fri, Jun 21, 2002 at 05:48:27PM +0100, David Laight wrote:
>
> > OTOH with modern disks that have 'voice coil' head motors
> > rather than 'stepper motors' track-track seek times are
> > not as dependant on the number of tracks being skipped.
>
> OTOOH, with modern disks that support tagged queueing and can
> reorder requests themselves, it's not clear we should use disksort
> at all.
With tagged queuing you can queue only a limited number of requests, much
less than what can be in the queue, so I think disksort is still usefull in
this case.
--
Manuel Bouyer, LIP6, Universite Paris VI. Manuel.Bouyer@lip6.fr
--