I have made some load test, where an Asterisk server was controlled to make a high number of calls to a FreeSWITCH, which was registered on Asterisk. Each had its own server. The calls made to the FreeSWITCH were answered and echoed. The CPU load on the FreeSWITCH server approached 100 % at around 100 calls. Similar test with an Asterisk server would show 2-3 times less CPU load. Looping back to the Asterisk, thus avoiding a possible CPU-loading application (echo), did not show a significantly different result.

The test has been done on a CentOS 4 and a FC8 with similar result.

Any hints about how to increase the capacity to the level of several times the level of Asterisk – as reported by others? Are we possibly dealing with some hardware issues related to the NIC and its drivers. /Jon