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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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