Wow, replying to myself for the SECOND time today ;)

anyway, after some more research, it appears that
the aumac driver indeed does not support vlan, and 
that the lower MTU size simply breaks ethernet (hey,
you learn something new every day!).

am I wrong?

----- Original Message ----- 
From: "Gilad Rom" <gilad@romat.com>
To: <port-evbmips@netbsd.org>
Sent: Monday, November 10, 2003 6:28 PM
Subject: Re: Au1100 Network Performance (Update)?


> One more thing I forgot to mention - The aumac0
> interface has A LOT of framing errors (though they 
> only appear to be in the outward direction).
> 
> # ifconfig -va
> aumac0: <UP,BROADCAST....
> .
> .
>     output: 933 packets, 1402415 bytes, 43394 errors
> .
> 
> the "input" line has no errors reported.
> 
> Also, the NIC in my laptop appears to support VLAN in hardware (ex0), 
> whereas the aumac0 driver does not. Could the MTU decrease
> performed by the vlan interface (mtu of 1496)
> actually cause such errors/performance hits?
> 
> 
> ----- Original Message ----- 
> From: "Gilad Rom" <gilad@romat.com>
> To: <port-evbmips@netbsd.org>
> Sent: Monday, November 10, 2003 5:42 PM
> Subject: Au1100 Network Performance?
> 
> 
> > Heya,
> > 
> > I have an AMD Alchemy Db1100 evaluation board,
> > which has the Au1100 MIPS cpu (using NetBSD-evbmips).
> > It Runs -current off of an 'mdsetimage'd kernel.
> > 
> > My setup is as follow:
> > 
> > [client] -> [VLan Switch] -> [Au1100] -> [Internet]
> > 
> > I am using the Switch to tag the Ethernet frames coming in 
> > from the client as vlan #4. The Db1100 board has only one Ethernet
> > interface, so I created a vlan4 interface, which is receiving the 
> > tagged frames, and then ipnat translates everything out of aumac0,
> > which is the original interface. It all works very well, except for 
> > one major thing: performance. Performance is somewhere along the lines
> > of 1.5Mb/s, which is a little wierd, since the same setup on my
> > pIII laptop running netbsd yields around 70Mb/s.
> > 
> > Am I wrong here, or is the processor simply unable to deliver 
> > higher throughput?
> > 
> > Thank you,
> > Gilad Rom
> > Romat Telecom
> > 
> > 
> > 
> 
>