Subject: Re: NewbieQ: NetBSD and drivers
To: Herb Peyerl <>
From: Anders Eriksson <>
List: tech-net
Date: 01/18/1996 16:56:25
In message <> you write:
> "Michael Graff" <>  wrote:
>  > I can reach about 7.9Mbps over a link with only two computers on it.
>  > This is better than SGI Indys can do.  They only get about 7.3Mbps  ;)
>  > The reason for the problem is, of course, the collision.  However,
>  > turning it off isn't right for two reasons.
> When I first got the 3c509 driver working reliably, I started doing 
> performance measurements between two identically configured Dell 4/66's
> with 3c509's in them on their own custom piece of coax because I was
> sure I'd be able to get more than 400kbps... After some tweaking and 
> thoughts from Charles/Chris/Theo, I finally got the transfer rate
> up to 1010kbps... I didn't think I was going to get much above that so
> I stopped there...  I did my measurements with 'ttcp'...
> In retrospect, I think it would have been good to continue and attempt to
> lower the amount of work the cpu did while maintaining that speed.  I see
> now that the driver gets nowhere near 1000kbps as many other fingers have
> been in there fixing various things (not to say they didn't need to be
> fixed)....

Excuse me if I've got this wrong, but Graff has got around 8 megabits/sec
and you're happy with 1 megabit/sec?! Fill me in....