On Thu, 19 Aug 1999, James Manning wrote:
it's the raid controller (Mylex DAC1164P). First time I've dealt with
something that put its devices there :)
ah ok. so you're running soft RAID on top of hardware raid. i missed
that. could this be another bottleneck? have you tried pure software
raid using normal scsi controllers?
> are you running the bonnies in singleuser? if so cpu util will nearly
> always approach 100%.
runlevel 3, normal multiuser, stock RH 6.0 install (besides kernel
which is 2.2.11-ac3). I pass mem=1024M since bonnie on ext2 has a
signed int (2^31-1) byte limitation and the 2GB of ram in the machine
i don't think the cpu util is too much of a worry. it probably means
there's not much else going on to occupy the cpu's. I've seen the
same thing with bonnie with high cpu util rates on a lightly loaded
machine, but the machine is still perfectly responsive, and other
cases where the cpu util rate was low, and yet responsiveness was
definitely poor (ide).
For writing, CPU util went DOWN, rates got a little worse (block).
For reading, CPU util stayed about the same, rates got BETTER.
Either bonnie prints out wildly wrong numbers for CPU util, or adding
in the use of the 3 Xeon's was cancelled out by SMP overhead (?)
you might want to try 2.3, which has much better SMP support. i
/think/ one of the changes made was that the various caches,
(block/page) were united into one, and locking for it was made more
fine-grained for SMP. (emphasise i think, i don't really know the
details).
James
regards,
--
Paul Jakma
[EMAIL PROTECTED] http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
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