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Poul-Henning Kamp authored
The parameter session_linger determines how many milliseconds the workerthread waits to see if another request has arrived, before handing the session over to the session herder. If we manage to catch the next request this way, we save a number of semi-expensive steps, if we hang around too long, the worker-thread gets to goof off. A relatively small sample of data from a live server, indicates that 20% of all requests arrive within 50 msec of the previous request and 50% within 100msec. It is not clear at present how these timeintervals relate to client RTT, or if they are systematically too high, due to the duration of the detour over the herder. There is a new line in varnishstat keeping track of how many times this gamble succeeds. Experimentation is encouraged. git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2663 d4fa192b-c00b-0410-8231-f00ffab90ce4
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