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Losing a TCP SYN requires a long painful (typically 3 second) delay before being retried. This patch creates a second parallel connection attempt for any nsHttpConnection which has not become writable before a timeout occurs. If you assume .5% packet loss, this converts a full 3 second delay from a 1 in 200 event into a 1 in 40,000 event. Whichever connection establishes itself first is used. If another one has been started and it does connect before the one being used is closed then the extra one is handed to the connection manager for use by a different transaction - essentially a persistent connection with 0 previous transactions on it. (Another way to think about is pre-fetching a 3WHS on a high latency connection). The pref network.http.connection-retry-timeout controls the amount of time in ms to wait for success on the initial connection before beginning the second one. Setting it to 0 disables the parallel connection, the default is 250. |
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