linux-kernel - Re: [SCSI][REGRESSION][BISECTED] Disk errors loop forever in 2.6.29

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Message-ID: <56979.43325.qm@web110612.mail.gq1.yahoo.com>
Date:	Thu, 19 Feb 2009 13:11:03 -0800 (PST)
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, rjw@...k.pl,
	Ingo Molnar <mingo@...e.hu>, linux-scsi@...r.kernel.org
Subject: Re: [SCSI][REGRESSION][BISECTED] Disk errors loop forever in 2.6.29

> From: James Bottomley <James.Bottomley@...senPartnership.com>
>
> Can you try this patch ... it was something I meant to get into 2.6.29
> but forgot about.  The key problem that you seem to be hitting is that
> the requeue evades the timeout check.  Moving the timeout check to block
> should fix that.

Even by itself this patch works although the behaviour is now different
to that of 2.6.28.  Whereas in 2.6.28 it would timeout very quickly
(after about 1 or 2 seconds) it now times out after 30 seconds
(initially I hadn't realised that it would be so much longer). The
other difference is that the failure becomes cached - trying to reread
the same area using dd instantly fails from now on without any more disk
IO/kernel error messages until echo 1 > /proc/sys/vm/drop_caches is
issued. Before it would always go straight to the disk for the unread
section and the kernel spew would be repeated before the failure.

I guess if this is new intended behaviour then all is well - it's just
different and slower/faster :)

Tested-by: Sitsofe Wheeler <sitsofe@...oo.com>

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