Avarage cpu load on OS3.9

[derringer3]

I recently installed a new scsi drive to my system. Everybody says that with scsi and 10 000 rpm drives read/write faster than 10Mbyte/sec and no cpu load. My problem is that when  after my system booted up, dopus (ver 4.17 pre20) shows a 17-33% cpu load for my 68040@33MHz. (Changing every sec between these numbers) When i copy something to one of my scsi partition to an other scsi partition, cpu load go up about 97%!!!. I knew that scsi had a dma! And only in sysspeed the result of drive test shows an avarage 9 Mbyte/sec transfer. Under dopus this is about 2.4-2.6 MByte/sec.
So this is OS3.9 performance or some util eat my cpu's time?

[derringer3]

I tried idle (68k version of course), its seems to be correct, only the same problem when copying files between scsi partitions. Not 97%, but it shows 67%. Anyway it gives mostly 0% when i do nothing.

[derringer3]

I'm using bppc's scsi, so it has dma. Hmmm mask: 0x7ffffffe

[derringer3]

I'm useing SFS.
I'm set the mask and maxtransfer to the values which patrik recommended.But no changeing in transfer rates.