problem with low efficiency of HP Smart Array 6i under FBSD

[peceka]

Hi,

have you noticed any problems with low efficiency of HP Smart Array 6i
under FBSD?
We've just made some tests on HP DL380 G4 (2GB RAM, 2x HDD ULTRA320
SCSI 15k, 2 x Pentium Xeon 3.6GHz with 2MB cache, raid Smart Array 6i
with HP SA6i Battery Backed Cache Enabler with FBSD 6.0 STABLE.

and second machine:
HP DL380 G4 (2GB RAM, 2xULTRA320 SCSI 10k, 2 x Pentium Xeon 3.4GHz
with 1MB cache, raid Smart Array 6i with HP SA6i Battery Backed Cache
Enabler - with Linux CentOS 4.3.

Our test:
#!/bin/sh

START="0"
END="10000"

while [ $START -lt $END ]; do
   dd if=/dev/zero of=$i.iso count=100000 > /dev/null 2>&1
   rm -f $i.iso
   START=`expr $START+1`
   echo $START
done


Time of executing this scripts:
FreeBSD: 149m 28s
Linux: 97m 13s

Time of creating one file:
dd if=/dev/zero of=plik.iso bs=1000 count=5000000
FreeBSD: 4397s
Linux: 2310s

dd if=/dev/zero of=plik.iso bs=100 count=50000000
FreeBSD: 299.6s
Linux: 214.1s

dd if=/dev/zero of=plik.iso bs=10 count=50000000
FreeBSD: 277.2s
Linux: 199s


Has someone any ideas what to do with this problem? I really don't
want to install Linux on this machines...

if there is a necessity, I can create some accounts for scsi hackers.