I had this problem on one (dual xeon) system. The cause was a very slow disk system - it was SAS but the OS decided to use it as IDE - and the killer was bandwidth logging by iptables.

Checking with wireshark it could sometimes take over a second for a packet to get out of an interface.

When I changed the disk driver and turned off bandwidth logging all the problems went away.

Vic Jolin wrote:
Hi my syslog.conf already has something like that, any other place I should look at?

On Thu, Dec 2, 2010 at 4:44 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:


On 12/1/10 9:41 PM, Vic Jolin wrote:
debug level is 9, do I have to set syslog to be configured asynchronously for this?

The rate of the calls is not more than 20 cps
if you diverted the log messages to a specific file, then add a dash '-' in front of file path:

http://www.kamailio.org/dokuwiki/doku.php/tutorials:debug-syslog-messages#custom_syslog_file

Cheers,
Daniel



On Thu, Dec 2, 2010 at 4:35 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,


On 12/1/10 9:33 PM, Vic Jolin wrote:
Hi all,

Just want to ask if anybody here has come across this problem of mine, when single call proxy is ok, but when you send more traffic to it, calls somehow get stuck, trying to make a new call it takes a lot of time and so it times out.

Does anybody know what could be the problem?

looks like you have some blocking operation there. Is it default config? What is debug level you use (if it is high, then be sure syslog is configured asynchronously). What is the rate of the new calls you send?

Cheers,
Daniel

--
Daniel-Constantin Mierla
Kamailio (OpenSER) Advanced Training
Jan 24-26, 2011, Irvine, CA, USA
http://www.asipto.com



-- 
Daniel-Constantin Mierla
Kamailio (OpenSER) Advanced Training
Jan 24-26, 2011, Irvine, CA, USA
http://www.asipto.com


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