Messages in this thread |  | | | Date | Thu, 09 Jun 2005 02:09:28 -0400 | | From | Jeff Garzik <> | | Subject | Re: Performance figure for sx8 driver |
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kallol@nucleodyne.com 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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