How does the driver determine the Synchronous transfer rate?

[Mads Bondo Dydensborg]

Hi there.

I am having trouble with a 2940UW (7881U) and a Quantum Atlas III drive.
In one machine I get:

Sep 28 18:59:40 sci11 kernel: (scsi1:0:-1:-1) Scanning channel for devices.
Sep 28 18:59:40 sci11 kernel: (scsi1:0:0:0) Synchronous at 40.0 Mbyte/sec,
offset 8.

This is as it should be, and gives me a nice performance.

Same hardware in another machine very similar machine (they should be 
identical, same adaptec BIOS setup) I get:

Sep 28 19:06:17 sci10 kernel: (scsi1:0:-1:-1) Scanning channel for devices.
Sep 28 19:06:17 sci10 kernel: (scsi1:0:0:0) Synchronous at 20.0 Mbyte/sec,
offset 8.

What gives? The disk now performs with about 50 % of the speed of machine
1.

I am confused. I have tried to figure out how the driver
(5.1.20) determines the Synchronous rate. I haven't been able to figure
it out.

Is there any way I can set this rate during module install or in the
source?

Mads

-- 
Mads Bondo Dydensborg.                               madsdyd at challenge.dk
Remember, never ask a geek "why"; just nod your head and back away slowly...



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