LSI53C1030 (Fustion MPT) performance

[Karl Pitrich <pit@0xff.at>]

hi,

i got a new ibm intellistation z pro dual xeon (6221-49G) with on board 
Fusion MPT chipset (LSI53C1030) and fast U160 disks.

2.4.20-8 (redhat) and 2.6.0-test9-vanilla 
(each customer compiled minimal kernels) 
both yield very poor disk performance.

i didn't do specific benkchmarking, but mv'ing a 3GB $HOME to another
partition takes at least 4x the time as on my old P4 workstation with
IDE drive.

is poor performance with this controller a known problem?
could that have to do something with smp?

in 2.6.0, the driver's cvs-versions seem to match the ones in the
sources offered by LSI for download.
lkml-archives and google weren't all too helpful.

any info/help apreciated,


 / karl


PS: in the course of this i studied dmesg and found:

  calibrating APIC timer ...
  ..... CPU clock speed is 3066.0234 MHz.
  ..... host bus clock speed is 133.0314 MHz.

is 'host bus clock speed' != front side bus speed?
this shows up also on other p4 machines with much faster FSB than 133
mhz.