[Freeswitch-users] XML_CURL max connection limit

Muhammad Shahzad shaheryarkh at gmail.com
Wed Jun 12 18:14:16 MSD 2013 

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
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> _________________________________________________________________________
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>>>>> http://www.freeswitchsolutions.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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>>>>
>>>>
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
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>>>
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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
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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>
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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
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