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Date:      Fri, 01 Sep 1995 01:32:42 -0700
From:      David Greenman <davidg@Root.COM>
To:        Bruce Evans <bde@zeta.org.au>
Cc:        hackers@freebsd.org
Subject:   Re: novell ne2000 cards with FreeBSD...opinions? 
Message-ID:  <199509010832.BAA22510@corbin.Root.COM>
In-Reply-To: Your message of "Fri, 01 Sep 95 17:29:56 %2B1000." <199509010729.RAA32626@godzilla.zeta.org.au> 

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>>Yeah, I just looked at the driver and saw the programmed IO cruft in there
>>to deal with the novell cards.  Bummer.  Someone mentioned that some of the
>>cards really do have shared memory and can run just like the SMC and 3COM.
>>Do you know anything about this?
>
>Shared memory on my NE2000/WD8013EBT card is 50% faster, but that isn't
>saying much.  The driver spends half its time bcopying to the shared
>memory instead of more that half its time doing explicit i/o instructions.
>The speeds are something like:
>
>	i/o instructions:	2MB/sec
>	bcopy:			3MB/sec
>	IDE disk controllers:	3.3MB/sec	PIO mode 0 (or 1?) spec
>	8MHz ISA bus max:	4MB/sec

   Your bus is slow. The 8013 usually has memory speeds of 4MB/sec.

-DG



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