For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

dragonflymr's avatar
dragonflymr
Icon for Cirrostratus rankCirrostratus
Dec 14, 2015

iRule - which option is better performance wise

Hi,   I need to reject request when given number of concurrent HTTP session is created (based on session cookie). So above limit I should not accept more requests.   I wonder which way will be le...
devops
http
iRules
LTM
performance
dragonflymr's avatar
dragonflymr
Icon for Cirrostratus rankCirrostratus
Dec 14, 2015

Hi Kai,

 

My filling was as well that performance wise it's better to use HTTP::cookie value $cookie ne "" in HTTP_REQUEST but you never know :-)

 

Based on iRule performance stats it as well seems that working in L7 is less cycle hungry that in L4.

 

Piotr

 

P.S. Not my idea, just found some iRule posted on the forum and modified it as much I my skills allowed :-)

 

Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Dec 14, 2015
If you really want to get sure which method is faster, then you may set a timestamp (e.g. set start_time [clock clicks] during "CLIENT_ACCEPTED" and then recheck this timestamp (e.g. [expr { $stop_time - $start_time }] when you have proven the existence of the cookie using the one and the other mothod. But I strongly believe this would be just for coriousity... ;-)