Date: Wed, 15 Dec 1999 08:11:18 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: grog@lemis.com (Greg Lehey) Cc: joeo@nks.net, freebsd-current@FreeBSD.ORG Subject: Re: Fallback to PIO (was: Errors from the ata disk driver) Message-ID: <199912150711.IAA08425@freebsd.dk> In-Reply-To: <19991215065232.A456@mojave.worldwide.lemis.com> from Greg Lehey at "Dec 15, 1999 06:52:32 am"
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It seems Greg Lehey wrote: > On Monday, 13 December 1999 at 9:03:16 +0100, Soren Schmidt wrote: > > It seems joeo@nks.net wrote: > >> Will the backdown to PIO mode be permanent till the next reboot of the > >> machine, or will the driver be able to attempt to return to DMA mode after > >> a timeout period. I'm only seeing these errors under really heavy disk > >> activity (mutlitple nfs readers and writers plus rsync/mirror jobs to the > >> vinum volume in question). > > > > The fallback is permanent, but it only occurs after 3 retries on the > > failed request. If it fails 3 times in a row, there is something > > really wrong on that channel, ie bad cableing etc etc... > > Wouldn't it be possible to find some way to manually reenable DMA? > Having to reboot seems rather hard. The retry count is pr request, and if the same request fails 3 times in a row, belive me you dont want to run DMA on that drive :) -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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