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Forum Discussion

jiseruk_43901's avatar
jiseruk_43901
Icon for Nimbostratus rankNimbostratus
Sep 26, 2013

Irule for getting total response time, server response time and server connection time

Hi. I have an irule that calculates total response time, server response time and server connection time for each requests and logs the data with high speed logging. But sometimes the connection time...
design
Kevin_Stewart's avatar
Kevin_Stewart
Icon for Employee rankEmployee
Sep 30, 2013

A few comments:

  • If you look at the actual order of events (on a v11 system), it should flow like this:

    CLIENT_ACCEPTED
HTTP_REQUEST
LB_SELECTED
SERVER_CONNECTED
HTTP_REQUEST_SEND
HTTP_RESPONSE
HTTP_RESPONSE_RELEASE

Your connection_time measurement is taken from the current time at SERVER_CONNECTED minus the LB_SELECTED time, which should just be the time it took to establish the 3-way handshake with the server. Assuming the "total response time" you're referring to is the calculated upstream_time, then it is certainly possible that a server side 3-way handshake could take longer than the actual request/response to that server (unlikely but not impossible) as the two aren't really related. This is part of the charm of OneConnect.

  • You won't get the same granularity, but the request logging profile will give you response size and response milliseconds (The elapsed time in milliseconds between receiving the request and sending the response) in an HSL logging profile without an iRule.