In some testing that I've done, anywhere from 1 to 10% of HTTP GETs and POSTs that apache receives are resulting in a TCP retransmission. I've captured a wireshark trace for these retransmissions and noticed that the HTTP GET or POST is being received, but no TCP ack is being sent out resulting in a retransmission. When the retransmission is received, the ack for the initial GET or POST is finally sent back. Has anyone ever seen such a problem? I don't see this issue with other TCP traffic so it appears to be related to apache. These tests were run with Apache 2.2.4 and on Linux 2.6.21. If a wireshark trace would be helpful I can provide one. Thanks for any input.
