From: Martin Shepherd <mcs@astro.caltech.edu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: Debugging a hard lockup with no symptoms
Date: Thu, 15 Apr 2010 15:47:07 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.1004151533090.24951@haggis.caltech.edu> (raw)
In-Reply-To: <alpine.LFD.2.00.1004151455230.3625@localhost.localdomain>
It is now looking as though the lockups may be caused by a problem in
the commercial analog I/O card that I am using, rather than in either
my code or the kernel. The dramatic increase in the frequency of the
lockups today, allowed me to associate the lockups with a couple of
outw() instructions that pass values to two digital to analog
converters on the card. When I comment out those instructions, or put
a few microseconds of delay between them, then the lockups stop. I
have talked to the manufacturer's tech support, and they have a
suspicion of the cause, and are working on trying to reproduce the
problem.
Martin
prev parent reply other threads:[~2010-04-15 22:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-14 7:26 Debugging a hard lockup with no symptoms Martin Shepherd
2010-04-15 12:59 ` Thomas Gleixner
2010-04-15 16:08 ` Martin Shepherd
2010-04-15 19:19 ` Martin Shepherd
2010-04-15 22:47 ` Martin Shepherd [this message]
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