sl@van-bc.UUCP (Stuart Lynne) (10/14/89)
I'm evaluating an Adaptec 1542 SCSI controller with a Miniscribe 3130 SCSI drive under SCO Xenix 2.3.2 GT. This is in a 25Mhz 386 box from Monolithic Systems (a pretty generic C&T style board, no cache). So far the results are pretty dismal. Just over 100kbps throughput. I've patched the kernel ad_xfer to 1 for 6.7Mbit DMA and setup the board in various ways. The 386 is running at 25Mhz, with the bus at 12.5Mhz and the DMA clock at 12.5Mhz. I use a simple test for timing the effective throughput for reading: time dd if=/dev/device of=/dev/null ibs=100k obs=100k count=100 My WD1006SR2 on the same system does the above in about 25 seconds for the raw device, and 26 for the cooked device. The Adaptec does it in about 94 seconds for the raw device and 180 for the cooked device. I've also tried a CDC SCSI drive with precisely the same timing results. Is this normal or do I have things setup wrong? -- Stuart.Lynne@wimsey.bc.ca ubc-cs!van-bc!sl 604-937-7532(voice) 604-939-4768(fax)