Date: Sat, 13 Nov 2004 11:00:30 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Robert Watson <rwatson@freebsd.org> Subject: Re: 5.3-RELEASE: WARNING - WRITE_DMA interrupt timout Message-ID: <4195DB3E.2040807@DeepCore.dk> In-Reply-To: <25539.1100339599@critter.freebsd.dk> References: <25539.1100339599@critter.freebsd.dk>
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Poul-Henning Kamp wrote: > In message <4195D903.2090801@DeepCore.dk>, =?ISO-8859-1?Q?S=F8ren_Schmidt?= wri > tes: > >>Zoltan Frombach wrote: >> >>>This is still an issue for me. Please read this post of mine: >>>http://lists.freebsd.org/pipermail/freebsd-stable/2004-November/009420.html >>> >>>Can anyone help? I would gladely install test patches to track this >>>problem down. My system is 5.3-R. And the WRITE_DMA warning happens at >>>least twice a day, it is so predictable. With thanks, >> >>Hmmm, that warning is issued from ATA when requests has been returned to >>the systems bio_taskqueue but the system hasn't finished them within the >>timeout. Now this is an indication of the system being unresponsive >>already at that point, or at least that was the idea. >>It has nothing to do with a bad drive, since the interrupt was seen the >>drive has finished the request it was asked, its the layers above ATA >>that doesn't respond to the request beeing returned as finished. > > It is not really the task of the ata driver to fail requests at that > time. How long is the timeout anyway ? Oh, ATA doesn't fail them, it just yells that the request hasn't been finished yet by the upper layers, it doesn't do anything to the request. Timeout is 5 secs, which is a pretty long time in this context IMHO.. However, if it can take that long time to get data pushed up the chain, it might also explain some of the reduced I/O performance reported ? -- -Sørenhelp
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