I am doing experiments to test out Linux's forwarding performance. I have a Linux box setup in the forwarding mode, to which I have connected a source and a sink (two other Linux boxes) (100 BT Ethernet). At around 20 K pps (64 bytes), the CPU utilization of the Linux router box is 26 %, but the Linux router starts dropping packets. When I debug using netstat, I see that the router is receiving 20 K packets (in 1 sec) , but is forwarding fewer than 20 K packets. But netstat does not report any drops at the output interface or any collisions. Are there any tools which could help locate the problem? Are there any test results for Linux router's performance on different machines? Also are there pointers to improve the forwarding performance of the routing code. Thanks. Irfan - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.rutgers.edu
