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

Jeremy Chadwick freebsd at jdc.parodius.com
Mon Jan 25 18:53:42 UTC 2010

On Mon, Jan 25, 2010 at 08:39:01PM +0200, Dan Naumov wrote:
> On Mon, Jan 25, 2010 at 8:32 PM, Alexander Motin <mav at freebsd.org> wrote:
> > Dan Naumov wrote:
> >> Alexander, since you seem to be experienced in the area, what do you
> >> think of these 2 for use in a FreeBSD8 ZFS NAS:
> >>
> >> http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPA.cfm?typ=H
> >> http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPA.cfm?typ=H&IPMI=Y
> >
> > Unluckily I haven't yet touched Atom family close yet, so I can't say
> > about it's performance. But higher desktop level (even bit old) ICH9R
> > chipset there is IMHO a good option. It is MUCH better then ICH7, often
> > used with previous Atoms. If I had nice small Mini-ITX case with 6 drive
> > bays, I would definitely look for some board like that to build home
> > storage.
> >
> > --
> > Alexander Motin
> CPU-performance-wise, I am not really worried. The current system is
> an Atom 330 and even that is a bit overkill for what I do with it and
> from what I am seeing, the new Atom D510 used on those boards is a
> tiny bit faster. What I want and care about for this system are
> reliability, stability, low power use, quietness and fast disk
> read/write speeds. I've been hearing some praise of ICH9R and 6 native
> SATA ports should be enough for my needs. AFAIK, the Intel 82574L
> network cards included on those are also very well supported?

That's just the thing -- I/O transactions, not to mention ZFS itself,
are CPU-bound.  If you start seeing slow I/O as a result of the Atom's
limitations, I don't think there's anything that can be done about it.
Choose wisely.  :-)

WRT the Intel 82574 series: em(4) supports this, just please be sure to
run RELENG_8 as there's been em(4) fixes and improvements which RELEASE
doesn't have.


If you have issues with the NIC(s), Jack Vogel at Intel can be of great
assistance.  :-)

| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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