From owner-freebsd-scsi Thu May 21 23:10:08 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA14527 for freebsd-scsi-outgoing; Thu, 21 May 1998 23:10:08 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from freebie.lemis.com (freebie.lemis.com [139.130.136.133]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA14413 for ; Thu, 21 May 1998 23:10:00 -0700 (PDT) (envelope-from grog@lemis.com) Received: (from grog@localhost) by freebie.lemis.com (8.8.8/8.8.7) id PAA10857; Fri, 22 May 1998 15:39:57 +0930 (CST) (envelope-from grog) Message-ID: <19980522153956.K27201@freebie.lemis.com> Date: Fri, 22 May 1998 15:39:56 +0930 From: Greg Lehey To: Guido Kollerie , freebsd-scsi@FreeBSD.ORG Subject: Re: CAM performance on -stable References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.91.1i In-Reply-To: ; from Guido Kollerie on Thu, May 21, 1998 at 11:34:26AM +0200 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Thu, 21 May 1998 at 11:34:26 +0200, Guido Kollerie wrote: > To get an indication of the perfomance of CAM I have performed three make > -j4 buildworld's. Once with the non-CAM kernel and twice with the CAM > kernel. /usr was mounted async,noatime and I used -O -pipe > -DCAM_OLD_TIMEOUT for CFLAGS, NOPROFILE was true > > To my surprise all the three buildworld times were nearly identical (3hr > 9min +/- 1min). I had expected the CAM kernel to perform much better as it > allows my BT-958 to use Command Tagged Queueing were as the non-CAM kernel > did not. > > Has anyone else found similar results on a -stable system? No, but I'd expect it. Make world doesn't really stress the SCSI system, since it doesn't handle more than one process at a time (well, not in a UP system, anyway). You'll see a lot more improvement if you use soft updates or async. Greg -- See complete headers for address and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message