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SubjectRe: Performance figure for sx8 driver
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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