Date: Thu, 18 Mar 2004 12:00:37 -0800 (PST) From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/60526: Post-PAE stable SMP machine freezes Message-ID: <200403182000.i2IK0bAg004053@freefall.freebsd.org>
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The following reply was made to PR kern/60526; it has been noted by GNATS. From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Doug White <dwhite@gumbysoft.com> Cc: Eugene Grosbein <eugen@kuzbass.ru>, bug-followup@FreeBSD.ORG, stable@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: kern/60526: Post-PAE stable SMP machine freezes Date: Thu, 18 Mar 2004 20:54:17 +0100 Doug White wrote: >>According to >>http://freebsd.rambler.ru/bsdmail/freebsd-hackers_2003/msg03936.html >>the problem may be related to the <ServerWorks ROSB4 ATA33 controller> >>and ATA write cache (hw.ata.wc=1). > The problem is with DMA mode on these controllers, not write caching. > Write caching may help to get the data rate up fast enough to trigger the > bug, and turning it off slows things down. > > I HIGHLY recommend using a DIFFERENT controller for disks. The ROSB4 is OK > for CDROMs and the like, but use a different controller for the system > drive. Promise controllers work great. :) Cant disagree with the last sentence, however my only i386 SMP machine has exactly the ROSB4 chip in it, and I use that for disks etc, newer had a problem with it, but again this is an ASUS board and they supposedly fixed the problem in HW (the *only* way to fix it btw). > ATA tagging is known to work with only a few disk models. You should > enable ATA tags ONLY if you KNOW your drive supports it, and test > extensively to ensure stability. To be more exact, only a very few disks supports tags, in fact I only know of IBM and a select few WDC disks that actually anounces support for tags. The ATA driver (in -stable) only tries to enable tags if the HW says it supports it and its a known to work drive. However the PAE import has broken tags support so it doesn't work on any disks :( -- -Søren
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