On Sep 25, Steve Paul wrote
> Greetings.
> 
> Any hints on beefing network performance using 100base NetGear
> cards? 
> 
> Throughput is average, but under heavy load and multi-port network
> applications, it starts to lag a bit and small amounts of packet loss 
> start to occur.  
> 
> Someone mentioned permiscuous mode earlier. What are the 
> configuration flags and does anyone else know any other de0 
> "tricks" to smooth out performance?  =)
> 
> My system boots as follows:
> de0 at pci0 dev 9 function 0
> de0: interrupting at irq 15
> de0: 21140A [10-100Mb/s] pass 2.2
> de0: address 00:40:05:a0:80:b8
> de0: enabling 100baseTX port
> 
> and eventually, I get a few of these:
> de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
> de0: abnormal interrupt: transmit underflow (raising TX threshold to 8|512)
> de0: abnormal interrupt: transmit underflow (raising TX threshold to 1024)
> 

These are the symptoms of DMA bandwith problems. What is your motherboard ?
what other PCI devices do you have in your PC ?

I see this on my Ppro, which has one of the first asus motherboard.
The same ethernet board on a newer motherboard works perfectly.

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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