ZFS ATA vs. ZFS CAM ATA performance on 8.1

[Alexander Best]

On Wed Jul 28 10, Dag-Erling Smørgrav wrote:
> Alexander Best <arundel at freebsd.org> writes:
> > 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.
> 
> I didn't look too closely at the details, but I don't understand why
> they include gzip and lzma compression in a filesystem performance test.
> 
> BTW, the 8 + head tinderbox runs ZFS on an 64 GB SSD.  When I tested
> ahci last October, I saw a 7% loss of performance with four paralell
> builds.  I haven't tried a newer kernel.

i'd like to do a benchmark UFS2+SU+SUJ ATA vs UFS2+SU+SUJ CAM ATA myself. any
recommendations which benchmarks/* port to use?

cheers.
alex

> 
> DES
> -- 
> Dag-Erling Smørgrav - des at des.no

-- 
a13x