[Freeswitch-users] XML_CURL max connection limit

Wed Jun 12 18:31:31 MSD 2013

Curious, I'm wondering if maybe excessive context switching is causing some
issues.. I'm wondering if the latency is actually caused by the overheads
on mod_xml_curl.

Could you try putting New Relic on your application, and see what sort of
response times you get? That will identify which queries are taking a while
to process.

Cal

On Wed, Jun 12, 2013 at 3:14 PM, Muhammad Shahzad <shaheryarkh at gmail.com>wrote:

> We are already monitoring using top and htop. Even per core view of top
> shows no core every goes beyond 40%, average varies between 21 - 33%.
>
> Thank you.
>
>
> On Wed, Jun 12, 2013 at 4:02 PM, Cal Leeming [Simplicity Media Ltd] <
> cal.leeming at simplicitymedialtd.co.uk> wrote:
>
>> You could either throw Cacti on the server, or use server density/new
>> relic trial for quick and easy graphing.. or you can just watch `top` and
>> push number 1 whilst running to see the CPU breakdown.
>>
>> Cal
>>
>>
>> On Wed, Jun 12, 2013 at 1:19 PM, Muhammad Shahzad <shaheryarkh at gmail.com>wrote:
>>
>>> Steven, i am using soft timer. Should i try another? Please suggest.
>>>
>>> Cal, no there is nothing unusually changes in RAM or CPU. BTW, i have 24
>>> CPU cores with 16 GB of RAM on each server. Regarding CPU graph, how can i
>>> enable it.
>>>
>>> Thank you.
>>>
>>>
>>>
>>> On Wed, Jun 12, 2013 at 1:15 PM, Cal Leeming [Simplicity Media Ltd] <
>>> cal.leeming at simplicitymedialtd.co.uk> wrote:
>>>
>>>> This sounds quite interesting.. From my own benchmarks, I've seen that
>>>> IVRs applications can be quite stressful on the server.
>>>>
>>>> Have you checked to see if there is a CPU util spike or context
>>>> switching spike during these tests? Perhaps you are hitting the floor limit
>>>> of what your CPU is capable of?
>>>>
>>>> Do you have CPU graphs? If not, can you enable them and try again?
>>>>
>>>> Cal
>>>>
>>>>
>>>> On Wed, Jun 12, 2013 at 10:21 AM, Muhammad Shahzad <
>>>> shaheryarkh at gmail.com> wrote:
>>>>
>>>>> 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 at 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 at 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 at 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 at 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
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> 
>>>>>> 
>>>>>>
>>>>>> Official FreeSWITCH Sites
>>>>>> http://www.freeswitch.org
>>>>>> http://wiki.freeswitch.org
>>>>>> http://www.cluecon.com
>>>>>>
>>>>>> FreeSWITCH-users mailing list
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Mit freundlichen Grüßen
>>>>> Muhammad Shahzad
>>>>> -----------------------------------
>>>>> CISCO Rich Media Communication Specialist (CRMCS)
>>>>> CISCO Certified Network Associate (CCNA)
>>>>> Cell: +49 176 99 83 10 85
>>>>> MSN: shari_786pk at hotmail.com
>>>>> Email: shaheryarkh at googlemail.com
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> 
>>>>> 
>>>>>
>>>>> Official FreeSWITCH Sites
>>>>> http://www.freeswitch.org
>>>>> http://wiki.freeswitch.org
>>>>> http://www.cluecon.com
>>>>>
>>>>> FreeSWITCH-users mailing list
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>>>>> UNSUBSCRIBE:
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>>>>>
>>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://wiki.freeswitch.org
>>>> http://www.cluecon.com
>>>>
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>>>>
>>>>
>>>
>>>
>>> --
>>> Mit freundlichen Grüßen
>>> Muhammad Shahzad
>>> -----------------------------------
>>> CISCO Rich Media Communication Specialist (CRMCS)
>>> CISCO Certified Network Associate (CCNA)
>>> Cell: +49 176 99 83 10 85
>>> MSN: shari_786pk at hotmail.com
>>> Email: shaheryarkh at googlemail.com
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org
>>> http://wiki.freeswitch.org
>>> http://www.cluecon.com
>>>
>>> FreeSWITCH-users mailing list
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>>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>>
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>>
>>
>
>
> --
> Mit freundlichen Grüßen
> Muhammad Shahzad
> -----------------------------------
> CISCO Rich Media Communication Specialist (CRMCS)
> CISCO Certified Network Associate (CCNA)
> Cell: +49 176 99 83 10 85
> MSN: shari_786pk at hotmail.com
> Email: shaheryarkh at googlemail.com
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
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