Date: Tue, 25 Aug 1998 13:58:19 -0500 (CDT) From: Joel Ray Holveck <joelh@gnu.org> To: dakott@alpha.delta.edu Cc: hackers@FreeBSD.ORG Subject: Re: Adaptec 1542i Performance on -stable [was Re: SCSI Controller] Message-ID: <199808251858.NAA00795@detlev.UUCP> In-Reply-To: <Pine.BSF.3.96.980821183753.26738A-100000@kott.my.domain> (message from David Kott on Fri, 21 Aug 1998 18:58:57 -0400 (EDT)) References: <Pine.BSF.3.96.980821183753.26738A-100000@kott.my.domain>
next in thread | previous in thread | raw e-mail | index | archive | help
> 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199808251858.NAA00795>