Re: Performance figure for sx8 driver

[kallol@nucleodyne.com]

Hello Jeff,
          Changing CARM_MAX_Q to 30 and upgrading the firmware to
firmware(BIOS-1.00.0.37, Firmware-1.3.19) does not help.

Anything else to try?

Kallol

Quoting Jeff Garzik <jgarzik@pobox.com>:

> 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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