lkml.org 
[lkml]   [2005]   [Jun]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Performance figure for sx8 driver
The following steps have been used to reproduce the problem.
I am not sure how hdparm worked on non-scsi or non-ide device.

> $ cat /proc/diskstats
> 1 0 ram0 0 0 0 0 0 0 0 0 0 0 0
> 1 1 ram1 0 0 0 0 0 0 0 0 0 0 0
> 1 2 ram2 0 0 0 0 0 0 0 0 0 0 0
> 1 3 ram3 0 0 0 0 0 0 0 0 0 0 0
> 1 4 ram4 0 0 0 0 0 0 0 0 0 0 0
> 1 5 ram5 0 0 0 0 0 0 0 0 0 0 0
> 1 6 ram6 0 0 0 0 0 0 0 0 0 0 0
> 1 7 ram7 0 0 0 0 0 0 0 0 0 0 0
> 1 8 ram8 0 0 0 0 0 0 0 0 0 0 0
> 1 9 ram9 0 0 0 0 0 0 0 0 0 0 0
> 1 10 ram10 0 0 0 0 0 0 0 0 0 0 0
> 1 11 ram11 0 0 0 0 0 0 0 0 0 0 0
> 1 12 ram12 0 0 0 0 0 0 0 0 0 0 0
> 1 13 ram13 0 0 0 0 0 0 0 0 0 0 0
> 1 14 ram14 0 0 0 0 0 0 0 0 0 0 0
> 1 15 ram15 0 0 0 0 0 0 0 0 0 0 0
> 160 64 sx8/2 1 0 8 10 0 0 0 0 0 10 10
> 160 65 sx8/2p1 0 0 0 0
> 160 128 sx8/4 1 0 8 20 0 0 0 0 0 20 20
> 160 129 sx8/4p1 0 0 0 0
> 160 192 sx8/6 1 0 8 20 0 0 0 0 0 20 20
> 160 193 sx8/6p1 0 0 0 0
> 3 0 hda 1 0 8 0 0 0 0 0 0 0 0
> 3 1 hda1 0 0 0 0
>
> $ mknod /dev/sda b 160 64
> $ mknod /dev/sdb b 160 128
> $ mknod /dev/sdc b 160 192
> $ ./hdparm -t /dev/sda &
> $./hdparm -t /dev/sdb
................

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/

\
 
 \ /
  Last update: 2005-06-10 16:43    [from the cache]
©2003-2011 Jasper Spaans