Ultra 320 in slow mode

Hi there I've just reinstalled my system on a softraid1 on two Seagate Cheetahs (36GB ST336607LW 68Pin Ultra320 SCSI) connected to an LSI21320-R. When booting up the controller's bios reports that the devices are certified for 80MB-s but should run at 320 once the OS has started. However all I get is this:

mother:-home-alex # hdparm -tdev-sda

dev-sda: Timing buffered disk reads: 168 MB in 3.11 seconds = 54.05 MB-sec mother:-home-alex # hdparm -tdev-sdb

dev-sdb: Timing buffered disk reads: 182 MB in 3.02 seconds = 60.18 MB-sec mother:-home-alex # hdparm -tdev-md0

dev-md0: Timing buffered disk reads: 200 MB in 3.00 seconds = 66.66 MB-sec

I was hoping to get something up to 640 actually as thhe drives are on different channels and the only devices on each channel: scsibus0: 0,0,0 0) 'SEAGATE ' 'ST336607LW ' '0008' Disk 0,1,0 1) * 0,2,0 2) * 0,3,0 3) * 0,4,0 4) * 0,5,0 5) * 0,6,0 6) * 0,7,0 7) * scsibus1: 1,0,0 100) * 1,1,0 101) 'SEAGATE ' 'ST336607LW ' '0006' Disk 1,2,0 102) * 1,3,0 103) * 1,4,0 104) * 1,5,0 105) * 1,6,0 106) * 1,7,0 107) *

The module used by the kernel is mptspi. SuSE 10.0 with mother:-home-alex # catproc-version (prerelease) (SUSE Linux)) #1 SMP Tue Sep 13 14:56:15 UTC 2005 Dual Athlon MP 2600+ on Asus A7M266-D, 1GB Ram (Remark: During installation I discovered in a painfully long stripping down process that the LSI would not let me install with any other card in the remaining 64bit slot. Simply froze during mkinitrd or later after starting GRUB) Any ideas how to speed this up? How can I test the drives' speed under winxp (yes, have got it somewhere on a drive in the machine, I think...) for comparison?

Help appreciated and a happy new year to all alex

-- "Terrorism is the war of the poor and war is the terrorism of the rich." (Sir Peter Ustinov)