Chris_G_Demetriou@UX2.SP.CS.CMU.EDU (Chris G Demetriou) wrote:

>> The aic7xxx cards do seem to be significantly faster than
>> the NCR 8XX cards especially with something like a wide Quantum Atlas.

I benchmarked the two controllers with NetBSD-1.1 and FreeBSD-2.1 and
all results are pretty similar. The test drive was a 2 year old
barracouda 2 GB. I posted the exact results several times, mail me if
you want then.

One thing I noticed is that a newer 2 GB barracouda is relativly slow
with the NCR, both in NetBSD-1.1 and FreeBSD-2.1, although it is as
fast as it should be under Windows 95 (with the NCR).

>Do you have any idea why that might be?

>I.e., i'm wondering about:
>	(1) PCI load caused by script instruction fetches?
>	    (fixed in some newer SIOP variants)

This would have caused the NCR controller to be slower in every
situation, wouldn't it? It seems that the NCR driver is slower only
with specific drives.

>	(2) the crappy state of the 'ncr' driver?

When I have some time, I'll try to see whether the NCR driver
performance varies for different drives more than the Adaptec. I hope
the newer Adaptec driver is imported since then.

Unfortunatly, my old reference drive broke some time ago, so I can't
get comparable results for newer BSD variants.

Martin
-- 
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Martin Cracauer <cracauer@wavehh.hanse.de>  -  BSD User Group Hamburg
BSD, Lisp and other programming info http://www.bik-gmbh.de/~cracauer