From: Garrick Staples <garrick@usc.edu>
Subject: 2.6.6 lockup
Date: Wed, 26 May 2004 14:11:16 -0700
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Hi all again,
   After fixing up the failover issues, I got my pair of Itaniums into
production with 2.6.5 and as soon as the real world load went up, the machi=
nes
started freezing.  No net response, no console, only sysreq keys work.

   I updated to 2.6.6 and it doesn't freeze up as often, but it's still rea=
lly
bad, at least a few times a day.  Unfortunately, I can't seem to figure out=
 how
to get a decent kernel trace.  Apperently sysreq-Crash doesn't work in ia64.
And NMI watchdog doesn't work on ia.  And I can't find any info on a hardwa=
re
watchdog on the mobo!

I do have some other info from sysreq on the cpu regs, memory, and processe=
s if
anyone would find that interesting.

The work load freezes up the machines under heavy streaming writes from abo=
ut a
100 processes on at least 60 clients.  A combined load of about 80GB/hour is
enough to freeze up the machine pretty regularly.

I tried Trond's 2.6.6 patches at his website, but those brokes things
considerably.  Since I don't have any actual Oops messages, anyone have any
experimental deadlock-fixing patches they want me to test? :)

--=20
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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