syslog-ng & alertd CPU usage

logging and clock are really heavy for cpu. Do you have an idea about how much request/sec you have going through your BIGIP ?

 

 

If you want to have an estimation you can use the timing command [url]http://devcentral.f5.com/wiki/default.aspx/iRules/timing.html[/url], [url]http://devcentral.f5.com/Default.aspx?tabid=63&articleType=ArticleView&articleId=123[/url]

 

 

I did some testing on a 6400 Platform with v9.4.3 and here is what i found when i did my tests:

 

 

[code]

 

iRule:

 

when HTTP_REQUEST timing on {

 

}

 

 

Result:

 

+-> HTTP_REQUEST 25190 total 0 fail 0 abort

 

| Cycles (min, avg, max) = (664, 683, 9969)

 

 

when HTTP_REQUEST timing on {

 

set actual_time [clock seconds]

 

}

 

 

Result:

 

+-> HTTP_REQUEST 69031 total 69031 fail 0 abort

 

| Cycles (min, avg, max) = (12461, 12601, 94735)

 

 

 

 

Command name average cpu cycles CPU usage / request max requests / second to take (100% cpu with the iRule ONLY!)

 

log 10064 0,000504871% 198070

 

clock 12601 0,000632142% 158192

 

[/code]

 

 

HTH