ZFS ATA vs. ZFS CAM ATA performance on 8.1

Zane C.B. vvelox at vvelox.net
Tue Aug 3 23:39:43 UTC 2010

On Tue, 27 Jul 2010 09:41:51 +0000
Alexander Best <arundel at freebsd.org> wrote:

> 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?

Not sure about any speed increases with ATA_CAM, but I for one
controller I have in this system I did get a massive boost and a end
to annoying disk issues with AHCI.
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