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Date:      Fri, 24 Mar 2000 11:54:32 -0800
From:      Mike Smith <msmith@freebsd.org>
To:        Brian Dean <brdean@unx.sas.com>
Cc:        mw@kpnqwest.ch, freebsd-current@FreeBSD.ORG
Subject:   Re: AMI MegaRAID lockup? not accepting commands. 
Message-ID:  <200003241954.LAA01357@mass.cdrom.com>
In-Reply-To: Your message of "Thu, 23 Mar 2000 23:15:16 EST." <200003240415.XAA32499@dean.pc.sas.com> 

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> > Can you try instead the changes that I just committed to -current?  I 
> > think that the problem shows up when the controller is heavily loaded; 
> > your patch will keep the load on the controller down, which may mask the 
> > 'real' bug.
>
> Just recently (this evening), I was able to get our controller to lock
> up with the latest patch.  Previously, with that patch installed, I
> must not have been able to tickle the bug just right, and I believe
> that Mike based his decision to make that mod based on my lack of a
> lockup, which always happened quickly.  That's what made me think that
> we'd solved it, but I guess I just got "lucky" on the previous lockups
> that happened very quickly, making me think it was more easily
> reproduceable that it actually is.

I'm not entirely sure about that; I think there are probably several sets 
of problems here.

Can you be more specific about "locking up" though?  The "controller 
wedged" bug is almost certainly not the same as the "lost interrupt" bug.

> It sounds like Markus may be onto something.

I'm somewhat corralled here today, but I might get some time to apply his 
suggestions on Monday, especially if you're happy it works for you as 
well.

-- 
\\ Give a man a fish, and you feed him for a day. \\  Mike Smith
\\ Tell him he should learn how to fish himself,  \\  msmith@freebsd.org
\\ and he'll hate you for a lifetime.             \\  msmith@cdrom.com




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