Messages in this thread | | | Date | Sat, 11 Jun 2005 02:18:14 -0400 | From | kallol@nucleody ... | Subject | Fwd: 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/
| |