[Users] xlog performance

[Christian Schlatter]

I recently did some performance testing with openser 1.1 and stumbled 
over a rather strange thing. The xlog command from the xlog module seems 
to cause a huge performance penalty.

I have a rather complex config with many routing blocks and mysql 
queries with which I can achieve up to 100 calls per second 
(authenticated INVITEs) per openser instance. As soon as I add *one* 
xlog statement to the config the cps rate goes down to 25, and the 
average SIP message response time goes up from <10ms to >200ms.

Has anyone else observed this behavior or could this issue be caused by 
a misconfiguration?

thanks,
Christian
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