anyting can do about udp traffic - please help

[Andy Green]

Somebody in the thread at some point said:
> Hi all
> 
> I use linux as GiGE router and have 6 NIC on it
> Those days the NIC interrupt takes around 100% CPU but the system is 4G
> memroy and 8 CPU. I can't see any error packet in this NIC interface too
> 
> After I block the udp, the %CPU drops. but the UDP only takes around 8M
> in general
> 
> We use UDP traffic for voice.

I would replace the Gigabit Ethernet card with a boring 100Mbps one as a
test, and confirm that the CPU usage is still crazy.  If it isn't, it is
something to do with the driver I guess.

Also check

dmesg

because if it is spamming the logs on each packet, that can cause a CPU
blowup.

Lastly... check with top if there is a hint that maybe some usermode app
or helper or daemon is implicated.

-Andy