Messages in this thread |  | | | Date | Fri, 10 Jun 2005 10:39:00 -0400 | | From | kallol@nucleody ... | | Subject | Re: 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/
|  |