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 [email protected]:
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 <[email protected]>:
[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
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