From owner-freebsd-hackers Tue Aug 25 11:59:19 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id LAA14363 for freebsd-hackers-outgoing; Tue, 25 Aug 1998 11:59:19 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from mail.camalott.com (mail.camalott.com [208.203.140.2]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id LAA14358 for ; Tue, 25 Aug 1998 11:59:12 -0700 (PDT) (envelope-from joelh@gnu.org) Received: from detlev.UUCP (tex-92.camalott.com [208.229.74.92]) by mail.camalott.com (8.8.7/8.8.5) with ESMTP id OAA01219; Tue, 25 Aug 1998 14:00:05 -0500 Received: (from joelh@localhost) by detlev.UUCP (8.9.1/8.9.1) id NAA00795; Tue, 25 Aug 1998 13:58:19 -0500 (CDT) (envelope-from joelh) Date: Tue, 25 Aug 1998 13:58:19 -0500 (CDT) Message-Id: <199808251858.NAA00795@detlev.UUCP> To: dakott@alpha.delta.edu CC: hackers@FreeBSD.ORG In-reply-to: (message from David Kott on Fri, 21 Aug 1998 18:58:57 -0400 (EDT)) Subject: Re: Adaptec 1542i Performance on -stable [was Re: SCSI Controller] From: Joel Ray Holveck Reply-to: joelh@gnu.org References: Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > I did have some strange kernel panics when I installed my hardrive > in front of the CDROM that previously had occupied the bus alone. > The drive would log timeout errors. Then, as now, my root > partition/swap et. al was on this drive, the kernel would panic. > Also, sporadically, the drive would load the kernel sucessfully for > booting, but would just hang when the kernel attempted to mount the > root partition. I configured the hardrive to supply the bus > termination, instead of the CDROM, as well as recompiling my kernel > sans the "TUNE_1542" option, and I haven't had a problem since. Many 1542s (particularly the B series) were very sensitive to poor cabling and termination problems. I also made a hack a while back (Jun 97) to allow one to manually (in the kernel config) configure the speed that TUNE_1542 will use ("TUNE_1542=200" etc). This was because in cold weather, on a cold boot (literally), the probe would try to run my 1542 at 150ns, which would reliably hang. After it warmed up a little bit, or after winter passed, it ran at 200ns every time. I posted the patch to -hackers, but didn't get a response. Does anybody have a use for me to add it back in? (I probably will do so anyway next winter.) Best, joelh -- Joel Ray Holveck - joelh@gnu.org - http://www.wp.com/piquan Fourth law of programming: Anything that can go wrong wi sendmail: segmentation violation - core dumped To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message