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
