I have one HBA connected directly to 4 SAS drives ... using a single 1 to four cable. On Mon, Jul 11, 2011 at 6:27 PM, Jack Wang <jack_wang@xxxxxxxxx> wrote: >> Hello Jack Wang and Lindar Liu, >> >> >> I am running the pm8001 driver (on applicable hardware including a >> several core SMP server). >> >> When I run on an older kernel -- e.g. 2.6.34.7 -- I get about 73Kiops >> via an fio test. >> >> When I run a current kernel -- e.g. 2.6.39.2 -- on the same system and >> same storage I get about 15Kiops running the same fio test. >> >> Perhaps something has changes in the kernel that is not being accounted > for? >> Are you two still maintaining this driver? >> >> >> Regards, >> David > [Jack Wang] Could you give your detailed topology, I will later try to > investigate the performance issue, but as I remember an Intel developer > reports in mailist some changes in block layer lead to JBOD performance > degradation. > > -- 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
