From owner-freebsd-scsi  Fri Mar 19 14:13:51 1999
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From: Andrew Heybey <ath@niksun.com>
To: Gerard Roudier <groudier@club-internet.fr>
Cc: freebsd-scsi@freebsd.org
Subject: Re: NCR 895 performance 
In-reply-to: Your message of Fri, 19 Mar 1999 22:06:00 +0100.
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> Things that can explain at least part of the difference may be, in my
> opinion:
> 
> 1 - Some important features of the chip not being enabled.
> 2 - The different number of tags.
> 3 - The way the FreeBSD ncr driver walk the CCB list on reselection.
> 4 - Also the number of interrupts.
> 
> Could you make the same benchmark using a small number of tags, for 
> example 8 and report the interrupts and IO statistics of both drivers for
> that benchmark.

Thanks for the reply.  When I get a little time, I will try the same
benchmark with the same number of tags for each controller.

> It would also be interesting to know which of the following features:
> - Prefetch
> - Burst-op
> - Cache Line size
> - Write and Invalidate
> - Bursting (and burst size max)
> - On-chip RAM
> were being used in your evaluation of the 895.

I used whatever sys/pci/ncr.c gives me.  Do you have any suggestions
as to which features should be set how?

andrew


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