FC1 x86_64: LVM+RAID crashes under load

[Douglas Kilpatrick]

> Nothing I have seen, but if you could send me the oops info (should be in
> messages or dmesg if gone from screen).  Also, detailed hardware specs,

The box locks up solid on this crash, so the oops info doesn't have a 
chance to go anywhere.  I can copy down the parts of it that are still 
on the screen, but its a deep stack trace, so important parts have 
scrolled off.

I'll get you lspci/dmesg info this eve.  Basically, Tyan Tiger K8W, dual 
244s, High Point "RocketRAID" controller (1540, I think.  The SATA 
controller on the MB not supported by Fedora yet).  Video card is an 
NVidia, but I'm not running X and don't have the module loaded.  Nothing 
else in any of the PCI slots.  Didn't happen under the non-SMP kernel. 
Two hard drives, each w/ four partitions:  swap, md2 (/boot), md1 (vg 
Mirror), md0 (vg Stripe).

I'm jacking up the shmmax sysctl to allow pgbench to run.  I don't 
remember the value off the top of my head.

Running "pgbench -c 2 -t 16384" will cause the box to go off into 
no-man's land.

(I've also noticed highly-variant performance w/ pgbench. when it 
doesn't lock.  Sometimes it will pull 1900 tps, sometimes 150.)

It does not crash when I boot the non-SMP kernel, and the benchmark 
results are much more stable.

I've attached a file giving the postgres configuration / process for 
blowing the box up in more detail.

Doug
-- 
kilpatds at oppositelock.org
Outta Control Racing, Inc.
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