Please let me know if you would like any more details. Can you point to the degradation reference in earlier mail? On Mon, Jul 11, 2011 at 7:44 PM, ersatz splatt <ersatzsplatt@xxxxxxxxx> wrote: > 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
