Current 7 U320 transfer rate only 3.300 MB/s

[Scott Long]

Dan Nelson wrote:
> In the last episode (May 30), Rod Person said:
> 
>>I have and LSI u320 SCSI controller on a TYAN Thunder K8WE board with
>>and nvidia4 chipset. My boot message displays the following
>>
>>da0 at mpt0 bus 0 target 0 lun 0
>>da0 <FUJITSU MAP3735NP 5605> FIXED Direct Access SCSI-3 device
>>da0 3.300MB/s tranfers, Tagged Queueing Enabled
>>
>>Why is my transfer rate so low? Anyone have an idea how I can correct
>>this?
> 
> 
> That may just be a display bug.  Does "diskinfo -t da0" report
> reasonable speeds?  If not, check your bios to see if you are forcing a
> slow speed, or try running "camcontrol negotiate da0 -R 160" to force
> 320MB speeds (160 Mhz * 16 bit bus = 320MB).
> 

It's a bug in the MPT driver, though it usually only manifests itself
with 4 or more drives.

Scott