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Date:      Sun, 24 Aug 2003 21:55:48 -0600
From:      Tillman Hodgson <tillman@seekingfire.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: hard disk performance issue
Message-ID:  <20030824215548.H30641@seekingfire.com>
In-Reply-To: <000001c36ab7$8017aae0$0300a8c0@owl>; from canman@ev1.net on Sun, Aug 24, 2003 at 10:18:05PM -0500
References:  <20030825003158.GA72370@falcon.midgard.homeip.net> <000001c36ab7$8017aae0$0300a8c0@owl>

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On Sun, Aug 24, 2003 at 10:18:05PM -0500, Chris Newman wrote:
> Hmm... when I do what you suggest, here's what I get...
> 
> tigger# dd if=/dev/ad8s1d of=/dev/null bs=64k count=100
> 100+0 records in
> 100+0 records out
> 6553600 bytes transferred in 0.147501 secs (44430888 bytes/sec)
> tigger# dd if=/dev/ad8s1d of=/dev/null bs=100k count=100
> 100+0 records in
> 100+0 records out
> 10240000 bytes transferred in 0.230168 secs (44489246 bytes/sec)
> tigger# dd if=/dev/ad8s1d of=/dev/null bs=200k count=100
> 100+0 records in
> 100+0 records out
> 20480000 bytes transferred in 0.429506 secs (47682693 bytes/sec)
> 
> ~47MB ? huge difference
> 
> I'm still not sure at this point what the best way is to evaluate whether
> I'm getting my money's worth out of this disk/controller. How do I do a good
> benchmark of the speed?

/usr/ports/benchmarks/bonnie++ with and without the new controller?

Of course, that'll only tell you if it's faster. "Value" means that
you're paying for extra speed that you actually /need/. The best way to
measure this is to benchmark whatever you use this particular computer
for and decide if any speed difference is worth the price of the
controller.

-T


-- 
The supreme irony of life is that hardly anyone gets out alive.
	- Robert Heinlein



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