Subject: Re: write cache on ATA drives
To: Sean Davis <dive-nb@endersgame.net>
From: Manuel Bouyer <bouyer@antioche.eu.org>
List: tech-kern
Date: 12/05/2002 23:58:07
On Thu, Dec 05, 2002 at 12:43:44PM -0500, Sean Davis wrote:
> Hi, a friend of mine has told me that using a drive with write caching
> enabled essentially negates any benefit of soft dependencies. I think I can
> see the logic behind that, ie if the drive reorders writes... my question
> is: how does one disable write cache on an ata drive? atactl does not seem
> to know about enabling/disabling it.

There's no way to do that for now. I should really add dkctl support
to wd.

However, I tried disabling write-back cache unconditinally a while ago,
in completely killed performances.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 23 ans d'experience feront toujours la difference
--