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Date: Thu, 9 Mar 2006 19:10:58 +0300 (MSK)
From: Oleg Sharoiko <os@rsu.ru>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-scsi@freebsd.org, Andrey Beresovsky <and@rsu.ru>
Subject: Re: Boot hangs on ips0: resetting adapter, this may take up to 5
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Update: custom amd64 kernels with reduced set of devices work. Tested 
RELENG_6 and HEAD both SMP and UP. Should I try to find a pair of kernels 
similar one to another, one of which would work and another wouldn't?

I've also discovered that it looks like isp driver in RELENG_6 is not safe 
with more that 4Gb of RAM. Under moderate load with 6G I get

"isp0: deferred dma allocation not supported"

which leads to various errors and finally to kernel panic. The same load 
never created problems with hw.physmem=2g and hw.physmem=4g under RELENG_6 
and with 6G under HEAD.

-- 
Oleg Sharoiko.
Software and Network Engineer
Computer Center of Rostov State University.