>>>>> "Craig" == Craig Dibble <[EMAIL PROTECTED]> writes:
Craig> Craig Dibble wrote:
>> Hi all,
>>
>> I have a question for any hardware experts out there: I'm currently
>> scratching my head over an unexpected performance issue with a
>> relative monster of a new machine compared to it's older, supposed
>> to be superseded counterpart.
Craig> By the way - as far as I have been able to ascertain all other
Craig> things are equal. Both boxes are using the same HP Smart Array
Craig> 6402/128 controller and all other settings are equivalent -
Craig> such as the cache/Accelerator Ratio settings.
I'd suggest having a look at the disk scheduler. If you're using AS,
try deadline instead. Otherwise write performance can suck for this
kind of setup (AS is really aimed at a single-user machine).
# cat /sys/block/sda/queue/scheduler
noop [anticipatory] deadline cfq
^^^^ This can be bad on RAID if you're a server.
# echo deadline > /sys/block/sda/queue/scheduler
then try again. CFQ is another one that may give good results.
--
Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au ERTOS within National ICT Australia
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