ZFS ATA vs. ZFS CAM ATA performance on 8.1

[Alexander Best]

hi there,

i just stumpled upon this article over at phoronix which benchmarks ZFS ATA vs. ZFS CAM ATA on freebsd 8.1 [1].
it seems read performance is really low when CAM ATA is enabled. i remember phoronix being famous for posting stupid benchmarks (RELASE vs. HEAD and such). however their benchmark results in this example seem to be valid.

any comments on that? has performance of ATA CAM increased in HEAD? would a UFS2+S+SUJ ATA vs. UFS2+S+SUJ CAM ATA also show equal results?

cheers.
alex

[1] http://www.phoronix.com/scan.php?page=article&item=freebsd_zfs_cam