Re: making sense of the timer(s) sequence

From: Aleksandar Lazic <>
Date: Wed, 20 Aug 2008 16:04:38 +0200

Hi Jeffrey,

On Die 19.08.2008 17:36, Jeffrey 'jf' Lim wrote:
>hi guys, i'm hoping to get a better sense of the timers and values in
>the logs, and am looking to clarify my own understanding in terms of
>both the sequence, and the meaning of the various timers. The following
>is what i've arrived at. Is the following understanding correct?
>In terms of a timeline, this is what happens: (assuming option
>httpclose, to make things simpler)
>half of Tw - a connection comes in, and may spend some time waiting in
>the listener's queue (*INCLUDING connection establishment)
>Tq - client sends request over
>the other half of Tw - time in the server queue
>Tc - syn, syn-ack delay to server
>Tr - server header response time
>Td (which is not logged directly)
>Am i correct? => 4.2.3) Timing events

Please check it by your own ;-)
Timers provide a great help in trouble shooting network problems. All values
are reported in milliseconds (ms). In HTTP mode, four control points are reported under the form 'Tq/Tw/Tc/Tr/Tt' :

         Td = Tt - (Tq + Tw + Tc + Tr)

     Timers with '-1' values have to be excluded from this equation. ###


Aleks Received on 2008/08/20 16:04

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