[OpenSIPS-Users] Strange performance problem

[Alejandro Ríos]

Hi all,

I'm running a sipp load test to an opensips instance on a 16 core, 8GB ram
blade server.  It's only 100 simultaneous calls, at 10 calls per second, and
I'm getting lots of retransmissions from the sipp UAC.

The strange thing is that I've tested the same exact scenario on another
server, an online VPS and on a local vmware virtual machine on my laptop,
using the same Centos 5.6 distro, the same simple opensips config, sipp
version, etc., and the load test runs perfect on those other boxes.

I've already tested on other two identical blades to discard hardware
issues. I've also discarded network issues, by running both opensips and
sipp on the same localhost IP.  I also ran tcpdump, and opensips using
strace, and the INVITES seem to get to Opensips, but somehow it can't
process the requests in a timely fashion.

Any ideas on what I should be looking for to troubleshoot this?

Thanks,

Alejandro.
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