*BSD News Article 82285


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From: Henry Wong <henry@cplabs.com>
Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.misc
Subject: Re: 100Base-TX: where's the bottleneck?
Date: Mon, 04 Nov 1996 10:37:24 -0800
Organization: DASCOM HOLDING Ltd.
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Curt Sampson wrote:
> 
> The problem is most likely in the drivers. As I recall, the FreeBSD
> driver doesn't do DMA on those cards.
> 
> A couple of people are talking about doing a DMA driver for NetBSD;
> if you or anyone you know is interested in working on a version
> that would work under NetBSD and FreeBSD, drop me a note.
> 
> BTW, you can use a program called `netperf' to test your performance
> instead of going to the trouble of writing your own code.
> 

	Yes, the driver just uses PIO mode, not Bus Master mode. But
I think even if it works on PIO mode, it shouldn't get so low
performance.
I changed hub to 10M hub, I got the performance about 7Mbs. Maybe that
is
a litter faster than normal 10M ethernet adpter's performance.
	Also I used netperf to test. I got the same result either on
100M ethernet or 10M ethernet.

Thanks

henry