Re: Performance figure for sx8 driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



[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


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux