Messages in this thread |  | | | Date | Fri, 10 Jun 2005 10:30:22 -0400 | | From | kallol@nucleody ... | | Subject | Re: Performance figure for sx8 driver |
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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/ >
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