Subject: Re: UVM/other problems for desktop users in current?
To: Jukka Marin , Daniel Carosone <>
From: Manuel Bouyer <>
List: current-users
Date: 12/18/2002 22:18:57
On Wed, Dec 18, 2002 at 09:37:52AM +0200, Jukka Marin wrote:
> But with the large RAM caches on the disk (like 8 MB in my case), can't
> the disk still do the actual (write) operations in an optimized order?

Yes, write. But not reads.

> Well, 8 MB may not be as good as a long command queue..

Probably not. A decent SCSI drive with a good SCSI controller can accept
commands for more data than its cache can hold, and request the data
later when there is enouth place in cache, wihtout host CPU interventions.

Manuel Bouyer <>
     NetBSD: 23 ans d'experience feront toujours la difference