From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 11646] QLA2xxx: Kernel deadlock on high load somewhere after 2.6.20
Date: Fri, 27 Feb 2009 08:17:21 -0800 (PST)
Message-ID: <20090227161721.516A511D10A@picon.linux-foundation.org>
References: <bug-11646-11613@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=11646





------- Comment #21 from grin@grin.hu  2009-02-27 08:17 -------
#20, enlighten me in the internals, please. Can multipathd actually _cause_
driver timeouts? 

As much as I understood directio checker does nothing more than reads first and
last sector of the device by direct IO (O_DIRECT) calls, and if that fails it
fires an uevent towards userspace to handle the situation.  Can it do anything
"below", like the qla driver, or the scsi device itself?

I tried 'tur' checker in the past with mixed results, and I'm not sure it meant
the path was really down that much or the checker failed, but directio seemed
the most generic.

I thought it's the other way around, eg. qla timoeuts which makes multipathd
cry.


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