Date: Thu, 2 Jan 2003 16:50:18 -0500 From: Barney Wolff <barney@pit.databus.com> To: Bruce Evans <bde@zeta.org.au> Cc: Bruce Campbell <bruce@engmail.uwaterloo.ca>, freebsd-hardware@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Followup to "fallback to PIO mode" on dual processor AMD systems Message-ID: <20030102215018.GA52185@pit.databus.com> In-Reply-To: <20030103062516.F755-100000@gamplex.bde.org> References: <1041526384.3e146e708b8e4@www.nexusmail.uwaterloo.ca> <20030103062516.F755-100000@gamplex.bde.org>
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On Fri, Jan 03, 2003 at 06:36:29AM +1100, Bruce Evans wrote: > > The fallback is clearly wrong because it turns isolated media errors > into pessimized i/o for the whole disk at best, system hangs during > resets next best, and system crashes at worst. I keep a disk with bad > media on line for testing some of this, and zap the fallback using the > following patch (hope this is complete; it was edited from a larger > patch). Perhaps the right answer is to test uptime and do the fallback if the error happens in the first minute, at least for permanently-mounted disks. In any case, retries in the current mode should be exhausted first. -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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