Date: Fri, 8 Sep 2000 15:40:02 -0700 (PDT) From: Tracy Camp <campt@thalvors.miralink.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Message-ID: <200009082240.PAA61976@freefall.freebsd.org>
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The following reply was made to PR kern/21139; it has been noted by GNATS. From: Tracy Camp <campt@thalvors.miralink.com> To: "Justin T. Gibbs" <gibbs@plutotech.com> Cc: freebsd-gnats-submit@FreeBSD.ORG Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Date: Fri, 8 Sep 2000 15:34:24 -0700 (PDT) On Fri, 8 Sep 2000, Justin T. Gibbs wrote: > >IBM DNES drives do not support more than 64 tagged queued commands and > >the default settings for maxtags is 255 which is problematic. Under heavy > >write loads this leads to a system crash. > > The problem here is the system crash, not that the table starts > out your drive with a tag count of 255. CAM should automatically > reduce the count to the maximum supported by the device. Can > you give some details about the panic you are seeing? A message along the lines of : (da2:ahc0:0:3:0): tagged openings now 64 Followed shortly thereafter by a system freeze/hang. Perhaps the word 'crash' was used too quickly here. What seems to be happening is that the drive stops responding which effectively is a 'crash' from my standpoint. Its been awhile since we dealt with this actually and I just now thought about reporting this back. Sorry if this isn't much use, I don't do kernel stuff normally but am one of the few that can work in C at all here. Tracy Camp Product Development Miralink Corp.PDX Portland OR 503-223-3140 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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