From owner-freebsd-current Tue Dec 14 23:10:38 1999 Delivered-To: freebsd-current@freebsd.org Received: from mojave.worldwide.lemis.com (mojave.lemis.com [192.109.197.162]) by hub.freebsd.org (Postfix) with ESMTP id 1FD061546C for ; Tue, 14 Dec 1999 23:10:34 -0800 (PST) (envelope-from grog@mojave.worldwide.lemis.com) Received: (from grog@localhost) by mojave.worldwide.lemis.com (8.9.3/8.9.3) id GAA00480; Wed, 15 Dec 1999 06:52:32 +1100 (EST) (envelope-from grog) Date: Wed, 15 Dec 1999 06:52:32 +1100 From: Greg Lehey To: Soren Schmidt Cc: joeo@nks.net, freebsd-current@FreeBSD.ORG Subject: Fallback to PIO (was: Errors from the ata disk driver) Message-ID: <19991215065232.A456@mojave.worldwide.lemis.com> Reply-To: Greg Lehey References: <199912130803.JAA33772@freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <199912130803.JAA33772@freebsd.dk>; from sos@freebsd.dk on Mon, Dec 13, 1999 at 09:03:16AM +0100 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message