8.0-RELEASE/amd64 - full ZFS install - low read and write disk performance

Alexander Motin mav at FreeBSD.org
Mon Jan 25 17:40:56 UTC 2010

Artem Belevich wrote:
> aoc-sat2-mv8 was somewhat slower compared to ICH9 or LSI1068
> controllers when I tried it with 6 and 8 disks.
> I think the problem is that MV8 only does 32K per transfer and that
> does seem to matter when you have 8 drives hooked up to it. I don't
> have hard numbers, but peak throughput of MV8 with 8-disk raidz2 was
> noticeably lower than that of LSI1068 in the same configuration. Both
> LSI1068 and MV2 were on the same PCI-X bus. It could be a driver
> limitation. The driver for Marvel SATA controllers in NetBSD seems a
> bit more advanced compared to what's in FreeBSD.

I also wouldn't recommend to use Marvell 88SXx0xx controllers now. While
potentially they are interesting, lack of documentation and numerous
hardware bugs make existing FreeBSD driver very limited there.

> I wish intel would make cheap multi-port PCIe SATA card based on their
> AHCI controllers.

Indeed. Intel on-board AHCI SATA controllers are fastest from all I have
tested. Unluckily, they are not producing discrete versions. :(

Now, if discrete solution is really needed, I would still recommend
SiI3124, but with proper PCI-X 64bit/133MHz bus or built-in PCIe x8
bridge. They are fast and have good new siis driver.

> On Mon, Jan 25, 2010 at 3:29 AM, Pete French
> <petefrench at ticketswitch.com> wrote:
>>> I like to use pci-x with aoc-sat2-mv8 cards or pci-e cards....that way you
>>> get a lot more bandwidth..
>> I would goalong with that - I have precisely the same controller, with
>> a pair of eSATA drives, running ZFS mirrored. But I get a nice 100
>> meg/second out of them if I try. My controller is, however on PCI-X, not
>> PCI. It's a shame PCI-X appears to have gone the way of the dinosaur :-(

Alexander Motin

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