Re: Quick questions about f5's iRules

1)      iRules are event-driven which means you can attach iRule code to various events that already occur in the BIG-IP system.  The standard full-proxy mode already fires all of these events, whether or not iRules are being used.  So there is no immediate performance impact just by attaching an iRule to a virtual server: in other words, the BIG-IP or the specific virtual sererv will not change modes and become less efficient just because iRules are being used.  However, there will be some CPU time required to run the actual iRule code.  This is very efficient, and for most iRules (which tend to be fairly trivial) the performance impact is negligible.  However, you can do just about anything you want in an iRule, so it is possible to significantly affect performance by creating a very intensive iRule.

2)      There are no published tests because each iRule is different.  However, BIG-IP includes some great timing functionality so you can determine how much CPU time your iRules utilize, and so you can optimize your iRule by making changes and observing the effects.

From: [email protected] [mailto:[email protected]] On Behalf Of Joo Yong-Seok
Sent: Tuesday, September 08, 2009 10:46 AM
To: Load Balancing Mailing List
Subject: [load balancing] Quick questions about f5's iRules

Hello Load-balancing Gurus,

I have simple questions about f5's iRules. Please share your experience if you have anything :-)

1) f5's iRule can impact their L4/L7 performance? it means if we're turning on the options, there is
   any performance degradation or improvement?(maybe upt to iRule script)
2) If there is any official marketing data in regards of iRule test, where can I get? (like Tolly group
    report).

Thanks in advance.

Best regards,

- yongseok

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