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Comment Re:F5 IRule (Score 2, Informative) 928

I recommend using a data class rather than setting a global variable.

Data classes are compiled at configuration load and are static, whereas setting the global variable with each firing of the event absorbs a small amount of processing time to reset the variable. Setting global variables can also move TMM into a slower processing regime. As the HTTP_REQUEST event is very 'inner loop', it is best to optimize it as much as possible.

If you absolutely have to set a global variable with a semi-fixed value, I recommend doing it during the RULE_INIT event.

(As of July 1st, F5 is offering expanded iRule support to Premium and Premium Plus support contract holders. Call in with your troublesome iRules, and you have a somewhat decent chance of ending up with me at the other end of the phone.)

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