Subject: Re: Au1100 Network Performance (Update)?
To: None <>
From: Gilad Rom <>
List: port-evbmips
Date: 11/10/2003 18:28:29
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" <>
To: <>
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