Re: 3c59x.c

Jared Mauch (
Wed, 27 Nov 1996 13:21:56 -0500 (EST)

I wrote a DoS program for testing beta cisco equipment that we get
that makes my 3c595 generate 33Mb/sec, but have not played with it in
months and months..

I've gotten transfer rates higher than that with ftp and programs
like tcpspray before.

Are you using full or half duplex? Full duplex (If your hub/switch
can handle it)

I'm also using a dual p133, but that doesn't matter since the
program can't use more than 1 processor at a time (not threaded, sorry
folks. :-)

- Jared

Note: I *WILL* not give out source or binaries of this program, because
it could be a *very* serious DoS attack if used on the real internet,
and I will not be involved in any such actions.

Phillip Dillinger graced my mailbox with this long sought knowledge:
> Hi,
> Does anyone know about bus mastering on the 3com 3c59x or 3c900 cards? When
> I enable bus mastering in the driver, as opposed to PIO, the data rate
> delivered to the card goes way down. As far as I can see, the kernel is
> taking about 10ms waiting for the DMA to finish for each transfer. I have
> heard of other people getting close to 100Mbps on this card, but either due
> to my kernel, 2.0.23, or my hardware, a Fugu P100, the bus mastering does
> not seem to work right.
> Any help or info is greatly appreciated.
> Sincerely, Phillip Dillinger
> .,