[SR-Users] replay of tls delayed by 30 secs.

[Andrew Chen]

The system does tcpdump real time on the system.  We do see the delay going
out the box to the destination client side by the 30 seconds.  There is
also suspicion about the network quality as well given we see retransmits
of ACK packets during the time the UPDATE was to be delivered.  I just want
to make sure there is nothing on the Kamailio side would be causing this
delay, which is what our engineering team is suspecting.

On Thu, Sep 27, 2018 at 11:23 AM José Seabra <joseseabra4 at gmail.com> wrote:

> Hi,
> So, Kamailio receives the UPDATE msg from your application server and
> relays it to the client and the delay is on UPDATE msg relay between
> kamailio and the client.
>
> As the wireshark capture the outgoing packages just after the OS
> processing them, then if you take a network trace, trigger the issue and
> try to identify the package sent by kamailio(UPDATE) in the network trace,
> there you can see if there is any delay between the application(Kamailio)
> and network level, comparing the time registered between the logs and the
> pcap.
>
> If the 30 seconds is not between the kamailio and network level, i would
> say that the issue is not in your kamailio box.
>
> Other way is trying to check out the OS sending queue status:
>
>    - netstat -altp
>
> Regards
>
> José
>
> Andrew Chen <achen at fuze.com> escreveu no dia quinta, 27/09/2018 à(s)
> 14:17:
>
>> So I log when the server side sends an UPDATE request to the Kamailio and
>> then I log when the t_relay is completed to the client application.  Those
>> were on the same second.  It's when the message left the box and then
>> arrived at the client side is where the 30 sec difference came from.  So
>> our engineering is questioning if the t_relay really did relay it properly
>> out of the system as it was logged.  They are suspecting there could be
>> some issue with the t_relay and the OS level tcp queue.
>>
>> On Thu, Sep 27, 2018 at 6:23 AM José Seabra <joseseabra4 at gmail.com>
>> wrote:
>>
>>> update to my last email.
>>>
>>> If do you see that the SIP transaction(UPDATE) arrives at your client
>>> fast enough, it isn't a problem with TCP send Queue (ignore my last email).
>>> Do you can see the reply to the SIP transaction(UPDATE)  sent from your
>>> client arriving to the host where kamailio is running? If not, seems that
>>> it isn't a problem in your Kamailio.
>>>
>>> Regards
>>> José
>>>
>>> José Seabra <joseseabra4 at gmail.com> escreveu no dia quinta, 27/09/2018
>>> à(s) 10:47:
>>>
>>>> Hi,
>>>>
>>>> Kamailio has some configuration options that logs a msg to the syslog
>>>> when some config script action takes more time that is expected, the
>>>> options are:
>>>>
>>>>    - latency_limit_action=500
>>>>    -
>>>>       https://www.kamailio.org/wiki/cookbooks/4.1.x/core#latency_limit_action
>>>>    - latency_limit_db=500
>>>>    -
>>>>       https://www.kamailio.org/wiki/cookbooks/4.1.x/core#latency_limit_db
>>>>    - latency_log=2
>>>>    - https://www.kamailio.org/wiki/cookbooks/4.1.x/core#latency_log
>>>>
>>>> The issue could also be related with the TCP write queue, maybe you
>>>> have set low values on the following parameters:
>>>>
>>>>    - tcp_conn_wq_max
>>>>       -
>>>>       https://www.kamailio.org/wiki/cookbooks/4.1.x/core#tcp_conn_wq_max
>>>>    - tcp_wq_max
>>>>       - https://www.kamailio.org/wiki/cookbooks/4.1.x/core#tcp_wq_max
>>>>
>>>> Other hint is to look for the OS  send Queue, the package could be
>>>> delayed because the other end is not reading it fast enough:
>>>>
>>>>    - netstat -altp
>>>>
>>>> it also will be important try to isolate the issue in terms of SIP, the
>>>> transaction delayed(UPDATE) is always the same in all situation that the
>>>> issue occurs?
>>>>
>>>> Hope that the information above helped you.
>>>>
>>>> Regards
>>>> José
>>>>
>>>
>>>
>>> --
>>> Cumprimentos
>>> José Seabra
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
>>> sr-users at lists.kamailio.org
>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>
>>
>> --
>> Andy Chen
>> Sr. Telephony Lead Engineer
>> 415 516 5535 (M)
>> achen@ <achen at thinkingphones.com>fuze.com
>>
>>
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>
>
> --
> Cumprimentos
> José Seabra
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>


-- 
Andy Chen
Sr. Telephony Lead Engineer
415 516 5535 (M)
achen@ <achen at thinkingphones.com>fuze.com

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