From owner-freebsd-questions Mon Jan 18 23:41:12 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA00165 for freebsd-questions-outgoing; Mon, 18 Jan 1999 23:41:12 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from power.connexus.net.au (power.connexus.net.au [203.12.22.20]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA00159 for ; Mon, 18 Jan 1999 23:41:09 -0800 (PST) (envelope-from greg@internex.net.au) Received: from inexmel1 ([203.12.22.40]) by power.connexus.net.au (8.9.1a/8.9.1) with SMTP id SAA22988 for ; Tue, 19 Jan 1999 18:41:04 +1100 (EST) (envelope-from greg@internex.net.au) Message-Id: <3.0.6.32.19990119184125.012a7e20@preeda.internex.net.au> X-Sender: greg@preeda.internex.net.au X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) Date: Tue, 19 Jan 1999 18:41:25 +1100 To: freebsd-questions@FreeBSD.ORG From: Greg Holloway Subject: 3.0R, aic7895, slow transfer rates Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi, Recently I installed 3.0R on a new PC with aic7895 SCSI controller and one Quantum Fireball Ultra-SCSI drive (50 pin). I am using the CAM driver. Performance is very poor (ie. 40-50% slower) compared to 2.2.8R with an aic7880 controller and the same drive. Here is the output from the CAM driver at bootup: da0 at ahc0 bus 0 target 0 lun 0 da0: Fixed Direct Access SCSI2 device da0: 5.0MB/s transfers (5.0MHz, offset 15), Tagged Queueing Enabled da0: 6180MB (12657717 512 byte sectors: 255H 63S/T 787C) I don't understand why it decided to use 5.0MB/s when the drive is capable of 10MB/s. I looked at all the scsi_mode pages using camcontrol but I can't find a way to adjust the speed. Any ideas whether this a problem with my drive, the aic7895, or the CAM driver? Thanks! Regards Greg Holloway To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message