Subject: Re: disks write-back cache
To: Jason Thorpe <firstname.lastname@example.org>
From: Manuel Bouyer <email@example.com>
Date: 04/29/2003 00:17:49
On Mon, Apr 28, 2003 at 02:42:43PM -0700, Jason Thorpe wrote:
> On Monday, April 28, 2003, at 02:02 PM, Manuel Bouyer wrote:
> >the "queue algorithm modifier" bits of the control mode page, maybe ?
> >SPC-3 says that the default value should be "restricted reordering",
> >really means no reordering.
> >I should try changing this, to see if it improve performances.
> >For a large sequential write, I'm not sure it would make much
> It certainly could make a difference! If you have a large sequential
> write, it could allow the disk to do a much larger internal write
> operation (merging the writes in its own buffer).
In this case I suspect it already gets the requests in increasing
blocks number order.
Manuel Bouyer <firstname.lastname@example.org>
NetBSD: 24 ans d'experience feront toujours la difference