Could you share your fio test scripts? disk detail and HBA firmware version are also wanted if available. Jack > > 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 -- 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
