I have a test case which shows unexpectedly poor performance for one scenario (TCP_CRR netperf test between 2 namespaces on 1 machine). This test case delivers under 1 round-trip per second, where it should be delivering more than 10000 round-trips per second. I have tried disabling Nagle, but that does not increase the observed rate. Are there any tools I should be using to investigate what is happening ? Or does anyone on this lisk know what is going on and how to fix it ? My test case is available here https://github.com/tjcw/bpf-examples/tree/tjcw-integration-1.2/AF_XDP-filter/netperf-namespace if anyone wants to try repeating my results. Chris Ward, IBM
