[Kamailio-Users] UDP packet loss

[Henning Westerholt]

On Wednesday 11 February 2009, Alex R.S.M wrote:
> I am performing SIP to SIP performance testing using Kamailio proxy
> (UAC-Kamailio-UAC). After increasing the load to 300 calls/sec Kamailio
> begins dropping UDP packets. (250 cps works fine). CPU utilization and
> network bandwidth looks fine. I think the bottleneck is the Linux UDP
> buffer size of the proxy server.  Here is the proxy server information:
>
> $ uname -a
> Linux lab-linux01 2.6.24-19-server #1 SMP Wed Jun 18 14:44:47 UTC 2008
> x86_64 GNU/Linux
>
> $ sudo sysctl -a | grep net.core.rmem_max
> net.core.rmem_max = 131071
>
>
> The question is if I increase the linux UDP buffer size do I need to change
> any configuartion parameter (like MAX_RECV_BUFFER_SIZE) in Kamailio?

Hi Alex,

we're using a bigger rmem_max size, and not increased the 
MAX_RECV_BUFFER_SIZE. So far we don't have any problems. :-) The UDP receiver 
buffer is probed during the startup of the server.

Cheers,

Henning