From owner-freebsd-questions Fri Nov 13 20:11:23 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA12050 for freebsd-questions-outgoing; Fri, 13 Nov 1998 20:11:23 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from grace.acm.rpi.edu (grace.acm.rpi.edu [128.213.5.20]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id UAA12044 for ; Fri, 13 Nov 1998 20:11:15 -0800 (PST) (envelope-from slk@acm.rpi.edu) Received: (qmail 300 invoked by uid 1120); 14 Nov 1998 04:10:49 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 14 Nov 1998 04:10:49 -0000 Date: Fri, 13 Nov 1998 23:10:48 -0500 (EST) From: Simon Karpen To: freebsd-questions@FreeBSD.ORG Subject: How do I disable Tagged Command Queue on a particular device? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG I've just installed 3.0-RELEASE (my first FreeBSD install, though I've been using SunOS, Solaris, Linux, and other Unix for several years). FreeBSD is on part of a Quantum Fireball ST, which is connected via a Buslogic BT-958 SCSI HBA. I know this drive has firmware bugs that make it unstable (command timeouts under Linux, CCB timeouts under FreeBSD) when run with a queue depth of larger than 7. Under Linux I add BusLogic=QD:[10,7] to the kernel command line. This limits the Queue depth of the fireball (target 1) to 7. I have yet to find a similar setting/command in FreeBSD. So, how do I do at least one of: disable tagged command queue globally disable tagged command queue for that drive limit queue depth to 7 I would greatly appreciate an answer, as I would like to give FreeBSD a real try, but I can't with SCSI timeouts under any sustained heavy write activity. -- Simon Karpen karpes@rpi.edu slk@acm.rpi.edu #include I don't speak for RPI in any way. "Those that give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety." --Ben Franklin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message