I had a similar experience. I was running 2.2.14 on a PIII-600, using FastE NICs, and using ttcp and netperf between machines on both sides of the linux router. I was able to push wire speeds, but that was only at MTU-sized packets. When I used small UDP packets, the router started choking on 40Kpps. Unfortunately, the testing tools overloaded the Linux router, and I had to abandon the test for the sake of my own sanity. ---- Dani Roisman droisman@station.sony.com > -----Original Message----- > From: Ali Irfan-FIA225 [SMTP:FIA225@email.mot.com] > Sent: Friday, July 07, 00 1:05 PM > To: 'linux-net@vger.rutgers.edu' > Cc: Singh Ajoy-ASINGH1 > Subject: Routing performance monitoring > > > 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 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.rutgers.edu
