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Date:      Mon, 27 Mar 2000 15:23:50 -0700
From:      "Kenneth D. Merry" <ken@kdm.org>
To:        Matthew Hanselman <mjhans@cs.wisc.edu>
Cc:        freebsd-scsi@FreeBSD.ORG
Subject:   Re: Terrible SCSI performance with 4.0 -- please help
Message-ID:  <20000327152350.A7100@panzer.kdm.org>
In-Reply-To: <200003272149.PAA14773@alumni.cs.wisc.edu>; from mjhans@cs.wisc.edu on Mon, Mar 27, 2000 at 03:49:33PM -0600
References:  <200003272149.PAA14773@alumni.cs.wisc.edu>

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On Mon, Mar 27, 2000 at 15:49:33 -0600, Matthew Hanselman wrote:
> I'm running 4.0-RELEASE on a K6-2 with an Adaptec 29160 and some IBM
> DMVS18M drives (nice 10k disks), and am getting absolutely terrible
> performance.  My setup has a Quantum IDE drive in it as well, and I get
> about 2X better read/write performance on the IDE drive than the SCSI
> (the SCSI should be a bit faster than the IDE...)
> 
> I've tried swapping in an Adaptec 2940 to no avail, so it's not the 29160
> specifically; I've tried moving the disks to another (Linux) box and the
> drives work perfectly fine, so it's not the drives/cables.  I don't know
> what else to try, even what other info to send out as diagnostics.
> 
> Apologies if this is not the right list; I'm running out of ideas, please
> point me to the right list if nothing else.  Thanks a lot.

Well, it'll take a little more information to try to track down the
problem.

How about dmesg output, and benchmark numbers from bonnie and iozone.

Also, is write caching enabled or disabled on those drives?  You can find
out with camcontrol, like this:

camcontrol modepage da0 -m 8

will print out mode page 8 for da0.

While you're doing the benchmarks, run top(1) to see if you're CPU bound.

Also, are you getting any error messages?

Ken
-- 
Kenneth Merry
ken@kdm.org


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