I need some help understanding a strange bridge performance problem I am seeing. Maybe I am making more out of this than I need to. I need your opinions. The setup: The first configuration is two machines connected via a cross over cable: Machine A <====> Machine B The second configuration is two machines with a Linux bridge between them: Machine A <===> Linux Bridge <===> Machine B I am using netperf to do some performance measuring. I am running two tests. One is the "streaming" test (the default test for netperf) and the other is the "Connect Request/Response" (TCP_CRR) test. When I run the stream test against the top two setups, I get near line speed. I am happy with these numbers. When I run the TCP_CRR test, for the first setup I get around 2200 connections per second, but in the second configuration I are getting around 700-800 connections per second. Why am I getting this big of a difference? I am running Redhat kernel 2.4.20-30.9 (RH9). I also changed the txqueuelen on the two bridge interfaces to 50000. Anyone have any idea why I am seeing such a big difference in the TCP_CRR test? The introduction of the Linux bridge cause me some real performance problems. --joubert
