Date: Thu, 04 Jun 1998 12:16:35 -0400 (EDT) From: Simon Shapiro <shimon@simon-shapiro.org> To: Greg Lehey <grog@lemis.com> Cc: Michael Hancock <michaelh@cet.co.jp>, "freebsd-current@freebsd.org" <freebsd-current@FreeBSD.ORG>, tcobb <tcobb@staff.circle.net>, Karl Pielorz <kpielorz@tdx.co.uk>, Bob Willcox <bob@luke.pmr.com>, Mike Smith <mike@smith.net.au> Subject: Re: DPT driver fails and panics with Degraded Array Message-ID: <XFMail.980604121635.shimon@simon-shapiro.org> In-Reply-To: <19980604095717.A22406@freebie.lemis.com>
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On 04-Jun-98 Greg Lehey wrote: ... >>> I had to put some pretty ugly validity checks in the interrupt code to >>> prevent my driver from trying to do an iodone (AIX's version of >>> biodone) >>> on already completed (or purged, I don't remember for sure...its been >>> over a year now) commands. Seems that the DPT firmware would (on >>> occasion) interrupt with a status packet that pointed to a ccb that my >>> driver had already completed. As I recall this would only happen under >>> heavy load and it was pretty intermittant. As far as I know, it was >>> never actually fixed. >> >> Actually, this is *extremely* relevant, if the firmware is still doing >> it and the DPT driver isn't aware of this. > > This would normally cause a 'biodone: buffer already done' message, > which is a warning, not a panic. The only way I could think of this > happening on a valid buffer (apart from the obvious of calling it > while it wasn't busy) would be if something messed around with other > buffer flags. I haven't been following this thread very > carefully--were the panics associated with SMP only? If so, how is > mutual exclusion performed in the bottom half of SMP drivers? Actually this is a 2.2 (UP :-) problem. Not a 3.0, and not an SMP for sure. Actually, SMP interrupt service is slow enough that this probably never has a chance to show at all. Simon (We are getting about 2/3 the interrupts/sec under SMP. Last we checked which was about 2 months ago). --- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG 770.265.7340 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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