Paul Sijben wrote: > Serge Orlov wrote: > > Paul Sijben wrote: > >> I am stumped by the following problem. I have a large multi-threaded > >> server accepting communications on one UDP port (chosen for its supposed > >> speed). > >> > >> I have been profiling the code and found that the UDP communication is > >> my biggest drain on performance! Communication where the client and the > >> server are on the same machine still takes 300ms or sometimes much more > >> per packet on an Athlon64 3000+ running Linux (Fedora Core 5 x64). > > > > [snip] > > > >> buf, address = socket.recvfrom(8192) > > > > I'm not an expert here, but I AFAIK UDP packet size should be kept > > below 512 bytes otherwise it can cause fragmentation and hence all the > > slow stuff like acknoledgements, timeouts, etc... > > > good point in general but in practice they are in this case. but this is > less of a problem on the loopback interface anyway.
Isn't it still controlled by MTU even on the loopback? What is your MTU on the loopback? -- http://mail.python.org/mailman/listinfo/python-list
