Date: Mon, 25 Mar 1996 08:15:59 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: syssgm@devetir.qld.gov.au (Stephen McKay) Cc: gibbs@freefall.freebsd.org, freebsd-current@freebsd.org, syssgm@devetir.qld.gov.au Subject: Re: Adaptec 1542B and 1522 on current kernels Message-ID: <199603251315.IAA25614@dyson.iquest.net> In-Reply-To: <199603250750.RAA25263@orion.devetir.qld.gov.au> from "Stephen McKay" at Mar 25, 96 05:50:52 pm
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> > My problem turned up after an upgrade (amongst other things) of my processor > from a 486DX33 to a 486DX4/100. I run FreeBSD 2.0.5 on it. I got lots of > sd0: timed out and MBO was 01 should be 00. My solution was to attempt to > avoid immediate reuse of mailboxes, based on a theory of how my BT545S could > be postponing mailbox updates when it was really busy. The MBO problems > disappeared, but the timeouts remained. > Certainly not to dispute problems that some people have been having, but using the bt driver with the BT545S, I had *extremely* stable SCSI subsystem operation. My machine was a 486/66 non-write back (early CPU.) I wonder if some MBs don't support cache invalidation properly? John
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