hard disk performance issue

[Tillman Hodgson]

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


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