You are right. After many improvements and modifications to dail plan, removing unnecessary modules and using Ngnix web server, things are much better now. Except that directory information is fetched 3 times per call and there are overall 4 HTTP hits in a single call (3 for user + 1 for dial plan). Since Monday, we have started analyzing the results of load test, specially looking into packet traces, voicemail recordings and so on. We observed a strange thing, although we were able to test 1536 concurrent calls (the limit we deliberately put in switch.xml.conf) at up to 64 calls per second rate. But there is strange and unexplained delay in starting RTP from FS side. FS plays an IVR in early media state, then answers the call to directly start recording voicemail. The problem is if call rate is under 25 CPS, everything works fine. At 25 CPS there is minor delay in starting RTP in early media state. This delay is negligible after processing few hundred thousand calls but after about 1.2 million calls the delay has creeps up to about 1.2 seconds. After 30 CPS this delay is significantly increases to 2 second after around 400 calls had done. At 50 CPS its ~3 second and after 60 CPS its around 4 seconds. Interesting thing is the delay is ONLY in starting playing IVR in early media state, once the IVR starts playing everything works perfectly fine. No call fails, but this delay would be annoying for anyone using the servers with over 30 CPS. Just to let you know, we checked everything, system resources, bandwidth usage, IVR file formats etc. all seems to be fine. We even tested with various FS start up options, e.g. -rp -nosql -nonat etc. etc. Nothing seems to have any impact on the results. I have run of out of possible explanations, so calling you guys for help. Thank you. On Fri, Jun 7, 2013 at 5:20 PM, Michael Jerris <mike@jerris.com> wrote:
I would need to see the specifics of your dialplan, but I suspect you have some transfers or execute extension that are causing it to re-enter dialplan. Are you sure on all the others that they are making the exact same requests? Details here will be necessary to understand exactly what is going on..
Mike
On Jun 7, 2013, at 4:07 AM, Muhammad Shahzad <shaheryarkh@gmail.com> wrote:
Guy, after detailed analysis i can confirm it was an Apache issue, and changing Apache configuration changes the concurrent call limit. However, one thing i observed about xml curl is that it makes several request with same parameters per call. Even if we have no calls running on server, as well as as Apache is completely free. I can see FS makes at least
1). 3 hits for dialplan. 2). 2 hits for directory. 3). 4 hits for voicemail. 4). 3 hits for ivr. 5). 2 hits for sofia. and so on..
While ideally only one hit should be sufficient to get all these configurations. What is the point of making all these redundant hits? We have roughly 15 - 20 hits made per call, which is huge and causes significant load on Apache.
Both Apache and FS are running on dedicated machines and connected over Gigabit Ethernet with zero packet loss, so i doubt these hits are "re-transmission".
Thank you.
On Thu, Jun 6, 2013 at 1:24 AM, Muhammad Shahzad <shaheryarkh@gmail.com>wrote:
Yes, its a feature, i know. I was just looking at how this feature was tested, as mentioned in its logs,
2010-01-04 15:01:51.945020 [INFO] mod_dialplan_xml.c:408 Processing 21653XXXXX->121637XXXXX in context termination 2010-01-04 15:01:52.054466 [ERR] mod_xml_curl.c:310 Received HTTP error 0 trying to fetch http://192.168.0.2/gateway.php 2010-01-04 15:01:52.054545 [CONSOLE] mod_xml_curl.c:317 XML response is in /tmp/6632ebb1-d19f-4d51-a07e-ec2ce0387f83.tmp.xml
Thank you.
On Thu, Jun 6, 2013 at 12:48 AM, Michael Jerris <mike@jerris.com> wrote:
This is adding a feature to allow timeout to be set in ms instead of seconds. This is not a problem, its a feature, that was added a while ago. Until you can determine if the request is being sent for the one thats failing, your not going to solve this issue.
Mike
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