lkml.org 
[lkml]   [2005]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectFwd: Re: Performance figure for sx8 driver



Hello Jeff,
How did you verify that performance improved making the
changes those
you suggested?

hdparm does not show it.

Regards,
Kallol

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





----- End forwarded message -----

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

\
 
 \ /
  Last update: 2005-06-11 08:21    [W:0.041 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site