<div>Hello,</div>
<div> </div>
<div>After days of debugging, I'll need some help from the SER specialists to troubleshoot this problem.</div>
<div>The SER version in service is: 0.9.9+cvs20090925</div>
<div>It's running on a Red Hat EL 5.3 server.</div>
<div> </div>
<div>I currently have about 10.000 users registered.</div>
<div>I encounter several seconds (1 to 5) without replies from the SIP proxy every 30 seconds.</div>
<div>Some requests are delayed, but most of them are not replied at all.</div>
<div>At the same time, all the 6 SER childs (forking is enabled) get about 100% used CPU (from "top")</div>
<div> </div>
<div>After some troubleshooting, I found that the rythm of those deny of service was exactly the time configured as the "timer_interval" parameter of "usrloc" module.</div>
<div>When changing the parameter, problem rythm changes as well.</div>
<div> </div>
<div>What we did so far:</div>
<div>- Check DNS and MySQL performances</div>
<div>- Moved the number of childs from 6 to 9</div>
<div>- Changed the "timer_interval" ("usrloc" module) from 60 to 900</div>
<div>- Stopped the "natping" feature ("nathelper" module) as it impacted the service as well.</div>
<div> </div>
<div>Please let me know if the problem has already been observed and what would be the best way to go deeper in the troubleshooting.</div>
<div>I need to solve that as soon as possible: some of our users higly suffer of random REGISTER not beeing taken into account.</div>
<div> </div>
<div>Sincerely,</div>
<div>Igor</div>