ZFS ATA vs. ZFS CAM ATA performance on 8.1

[Alexander Best]

On Tue Aug  3 10, Zane C.B. wrote:
> 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.

just noticed somebody started a new discuccion about the article i mention on freebsd-questions@ [1].

cheers.
alex

[1] http://www.mail-archive.com/freebsd-questions@freebsd.org/msg236201.html

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a13x