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To: Jakob Oestergaard <jakob@unthought.net>
Cc: Greg Stark <gsstark@mit.edu>, linux-kernel@vger.kernel.org
Subject: Re: More tests [Was: Problem with read blocking for a long time on /dev/scd1]
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	<20021222201345.GG30634@unthought.net>
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From: Greg Stark <gsstark@mit.edu>
Organization: The Emacs Conspiracy; member since 1992
Date: 23 Dec 2002 03:58:02 -0500
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Jakob Oestergaard <jakob@unthought.net> writes:

> On Sun, Dec 22, 2002 at 11:13:14AM -0500, Greg Stark wrote:
> > 
> > I've done some more tests:
> > 
> > The problem still occurs with straight ide drivers, no ide-scsi
> > 
> > The problem still occurs with 2.4.20-ac2
> 
> Can you reproduce on 2.4.18 or 2.4.19-pre5 ?
> 
> AFAIK 2.4.X broke at 2.4.19-pre6 - something was changed that related to
> the order in which read requests are scheduled.

I originally had the problem with 2.4.18 and only updated to 2.4.20-ac2 hoping
it would solve the problem. It doesn't look like the same issue as yours.

When your process is blocked, what wait channel does ps -elf list for it?
What system call does strace -T show it executing and for how long?

I wonder what else is on the ide channels, perhaps if I move things around so
it's the only device on that channel it would help?

-- 
greg

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