Once upon a time, Les <hlhowell@xxxxxxxxxxx> said: > Ethernet only works well when the network is utilized about 50%. I'm familiar with how Ethernet works, and this is not Ethernet that is a problem. Properly configured switched Ethernet can work without errors at much more than 50% (I do that every day). Gigabit Ethernet should run much faster than 200Mbps. When I ran a similar test with a Fast Ethernet interface, I saw similar "stuttering" behavior, but it still averaged around 70-80Mbps. There is no router in my problem setup; this is two systems connected to a switch (not a hub). Neither is running anything else (one is booted in rescue mode). Both systems show full duplex 1000Mbps link with flow control enabled (both have tg3 chips). I was going to try jumbo frames to see what difference that made, but one system doesn't support jumbo frames. The fact that Linux stops sending on the network sometimes and stops reading the hard drive other times points directly to how the kernel is caching writes to NFS (but I can't tell if it is the filesystem layer or the network stack). -- Chris Adams <cmadams@xxxxxxxxxx> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble.
