[email protected] wrote:
Does anyone have performace figure for sx8 driver which is for promise SATAII150
8 port PCI-X adapter?
Someone reports that on a platform with sx8 driver, multiple hdparms on
different disks those are connected to the same adapter (there are 8 ports) can
not get more than 45MB/sec in total, whereas a SCSI based driver for the same
adapter gets around 150MB/sec.
Any comment on this?
Known. Early firmwares for SX8 had problems that forced the driver to
limit the number of outstanding requests, for all ports, to _one_.
Later firmwares have fixed this, but the driver has not been updated to
detect newer(fixed) firmwares.
You may update drivers/block/sx8.c as such:
- CARM_MAX_Q = 1, /* one command at a time */
+ CARM_MAX_Q = 30, /* 30 commands at a time */
if you have a newer firmware, to obtain much better performance.
Jeff
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