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Date: Wed, 18 Feb 2009 11:16:43 -0800 From: Mike Anderson <andmike@...ux.vnet.ibm.com> To: Ingo Molnar <mingo@...e.hu> Cc: Alan Stern <stern@...land.harvard.edu>, linux-scsi@...r.kernel.org, James Bottomley <James.Bottomley@...senPartnership.com>, Jens Axboe <jens.axboe@...cle.com>, "Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org Subject: Re: scsi: aic7xxx hang since v2.6.28-rc1 ... Ingo Molnar <mingo@...e.hu> wrote: > > * Alan Stern <stern@...land.harvard.edu> wrote: > > > I have no idea if this will make any difference for the > > problem you're seeing, but it has been submitted and it's > > worth trying out. If the problem still occurs, I'll write a > > diagnostic patch to add log messages giving the destiny of > > each request in scsi_io_completion(). > > OK, i've undone the reverts and have applied your fix - it will > take a few hours to see whether the hang still occurs. > I know already started your testing, but.. I find it informative to set my scsi logging to the value below to display non-zero IO status on commands. The overhead impact is low for good completions. sysctl -w dev.scsi.logging_level=4100 Note: This does not provide the exact policy that scsi_io_completion will take on the IO, but it provides the input to scsi_io_completion which should help. -andmike -- Michael Anderson andmike@...ux.vnet.ibm.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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