Retransmissions seen for HTTP GETs and POSTS (Apache Users)

Retransmissions seen for HTTP GETs and POSTS

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To: <users@xxxxxxxxxxxxxxxx>

Subject: Retransmissions seen for HTTP GETs and POSTS

From: "Nayman Felix-QA5535" <Felix.Nayman@xxxxxxxxxxxx>

Date: Sun, 27 Apr 2008 17:37:17 -0400

Cc: "Brown Chris-CCB034" <Christopher.Brown@xxxxxxxxxxxx>, "Kolodziej Cezary-QA5753" <Cezary.Kolodziej@xxxxxxxxxxxx>

Reply-to: users@xxxxxxxxxxxxxxxx

Thread-index: Aciort24VaP4VXYbRIWZuiVce9B82w==

Thread-topic: Retransmissions seen for HTTP GETs and POSTS

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.