On Wed, 2010-02-10 at 14:19 -0600, scameron@xxxxxxxxxxxxxxxxxx wrote: > We have seen the amount of commands per lun that are sent to > low level scsi driver limited to 16 commands per lun, > (seemingly artificially, well below our can_queue and > cmd_per_lun limits of 1020) > > 2.6.29 does not exhibit this bad behavior. > 2.6.30, 2.6.31, 2.6.32 (2.6.32.1 through 2.6.32.8) do exhibit this bad behavior > 2.6.31-rc1 does not exhibit this bad behavior I can't think of any reason for this. Best guess at the fix would be the new queue full ramp up ramp down code, but no clue as to what the problem is ... no other drivers seem to have noticed the performance problems this would likely cause ... and 2.6.32 is becoming the standard enterprise kernel. James -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
