> The specific command I ran was "iperf -i 1 -N -d -P3 -c 192.168.0.1" -
> from the options on my Gentoo box, -d says it does a bidirectional test
> simultaneously, testing (I presumed) duplex.
> 

ah yeah, it is full duplex with that option.  I assumed you were doing
nothing but a -c and -s.


> > rl's are known for poor performance, but should be better than that
> > unless you're only running a 100-200 MHz machine or so.
> 
> I just barely miss that category... ;-)
> CPU: AMD-K6(tm) 3D processor (300.68-MHz 586-class CPU)
> 

hah  Well...that's probably the best you can get on that.  :)  With rl
NIC's at least, since they're interrupt happy.  When you're testing
throughput, can you try to run 'top' at the console or a SSH session? 
I'm curious what your CPU utilization will be.

I had a rl NIC in a P3 600 FreeBSD box, and it could only do about 70
Mb to another host on my LAN.  Put a Intel fxp in the same box, and it
could do 100 Mb at wire speed.  With an Intel gig 'em' card, the same
box can do 400 Mb though a single NIC.  Considering that when you're
passing traffic, you can roughly cut that number in half, that P3 600
could have only done probably 35 Mb in a firewalling scenario with rl
NIC's.  Yes, they really are that bad.  :)  At 70 Mb with the rl, the
P3 600 was pegged at 100% CPU, mostly from interrupts.

A P3 600 is easily 2-3 times as fast as a K6 300, so those numbers
don't look too out of wack.


> rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         media: Ethernet autoselect (100baseTX <full-duplex>)
> 

looks fine.  I bet if you replace the rl NIC's with fxp's, you'll see
a huge improvement in performance.

-cmb

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