[SR-Users] Kamailio Stop processing SIP traffic

Henning Westerholt hw at gilawa.com
Mon Dec 27 18:39:22 CET 2021 

Hello,

are you using dialog profiles by any chances? I have encountered an issue here before: https://github.com/kamailio/kamailio/issues/2923

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>

From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of pwerspire
Sent: Monday, December 27, 2021 5:45 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Kamailio Stop processing SIP traffic

Already checked with sngrep and the INVITES are arriving.

I don't believe that is something related to the server because is not normal that when the issue happens, dialog commands like "kamcmd dlg.list" stop returning any prompt. During the time that the issue is not happening yet, the command just returns that is too big, then when Kamailio stops processing the Sip messages, the command will not work anymore.

Unfortunately, I cannot share the kamailio.cfg file.

Thanks,
Tiago

Sergio Charrua <sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>> escreveu no dia segunda, 27/12/2021 à(s) 14:12:
ok, let's go 1 step at a time.

stop all firewalls, if any.
install sngrep SIP monitoring tool on your server
start sngrep and then (re)start your test script until you see Kamailio stoping accepting calls
check if sngrep receives SIP Invites

Also, please share your kamailio.cfg . It might help too.

obrigado,


Sérgio Charrua

[http://cdn.shopify.com/s/files/1/0380/5305/t/11/assets/logo.png?11469850511917603945]

www.voip.pt<http://www.voip.pt/>
Tel.: +351 <callto:+351+91+104+12+66> 21 130 71 77

Email : sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>
This message and any files or documents attached are strictly confidential or otherwise legally protected.
It is intended only for the individual or entity named. If you are not the named addressee or have received this email in error, please inform the sender immediately, delete it from your system and do not copy or disclose it or its contents or use it for any purpose. Please also note that transmission cannot be guaranteed to be secure or error-free.






On Mon, Dec 27, 2021 at 12:23 PM pwerspire <pwerspire at gmail.com<mailto:pwerspire at gmail.com>> wrote:
Hi,

I just repeated the test and there is no Kamailio process at 100%, they are low all the time even when the issue starts to happen.

I went through the logs and couldn't find any error, unfortunately, with 100 CPS I can't put it on debug mode but only in info.

Regards,
Tiago

Ovidiu Sas <osas at voipembedded.com<mailto:osas at voipembedded.com>> escreveu no dia quinta, 23/12/2021 à(s) 03:15:
Check with htop if you don't have any kamailio procs at 100% CPU (due
to a deadlock).
Do you see any errors in the logs?

-ovidiu


On Wed, Dec 22, 2021 at 11:44 AM pwerspire <pwerspire at gmail.com<mailto:pwerspire at gmail.com>> wrote:
>
> The CPU is around 30% during the test, is always really stable and memory doesn't increase much.
>
> I'm using children=8.
>
>
>
> Sergio Charrua <sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>> escreveu no dia quarta, 22/12/2021 à(s) 16:27:
>>
>> any statistics regarding CPU use? how many threads?
>>
>> Sérgio Charrua
>>
>>
>> www.voip.pt<http://www.voip.pt>
>> Tel.: +351 21 130 71 77
>>
>> Email : sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>
>>
>> This message and any files or documents attached are strictly confidential or otherwise legally protected.
>>
>> It is intended only for the individual or entity named. If you are not the named addressee or have received this email in error, please inform the sender immediately, delete it from your system and do not copy or disclose it or its contents or use it for any purpose. Please also note that transmission cannot be guaranteed to be secure or error-free.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Wed, Dec 22, 2021 at 3:57 PM pwerspire <pwerspire at gmail.com<mailto:pwerspire at gmail.com>> wrote:
>>>
>>> Hi Sergio,
>>>
>>> Thanks for your reply.
>>>
>>> This is a google cloud VM with 8 vCPU,  I'm using 100 CPS but the number of simultaneous calls is stable at around 1071 at any given time.
>>>
>>> Also, I can always see INVITES going inside the server but Kamailio stops answering them, even if you stop sending calls for a long time, and then send a single call, Kamailio will not reply anymore to the Invites.
>>>
>>> When Kamailio stops replying to INVITES, If I do for example a "kamcmd dispatcher.list" I have the correct output, but if I do a "kamcmd dlg.list" it will not provide any output and not give back the prompt( before it would just answer that the reply was too big).
>>> I will need to use "control + c" to get the prompt of the shell back and after that, all kamcmd commands stop returning any output or giving back the prompt.
>>>
>>> If the Kamailio is then restarted, everything starts working correctly again. Also, another note is that this seems only to happen when DMQ is in use and replicating to the fallback Kamailio.
>>>
>>> Regards,
>>> Tiago
>>>
>>>
>>> Sergio Charrua <sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>> escreveu no dia terça, 21/12/2021 à(s) 13:38:
>>>>
>>>> What is the call length of each call? How many NICs you have on that server? what networking switches are you using? all these variables have huge impacts on the call flow!
>>>>
>>>> Let's say you make 100CPS and the call length is 10 minutes.
>>>> At 10 seconds you will have 1.000 ongoing calls using g711 (64kbps). You will have around 64Mbps bandwidth being used.
>>>> At 1 minute you get 6.000 ongoing calls and will use 390Mbps bandwidth!
>>>> Near the 10th minute you will be using almost 4Gbps bandwidth and 60.000 ongoing calls!!
>>>>
>>>> Maybe the issue is not within Kamailio and/or the media server, but within your network capacity ...
>>>>
>>>> On my side, on a 4 vCPU and 4GB Ram, Kamailio 5.2 gets me around 400cps with calls up to 30seconds length, and RTPEngine goes OK too. I am sure I could do more, but I don't bother much, this is more than enough!
>>>> But I have an enormous amount of bandwidth and 3 NICs on the server. NICs are the key . Remember that Kamailio only processes SIP messages.
>>>> At 5 minutes, using the above call details, you've already sent 30.000 SIP INVITES minimum and many more SIP messages during that time. You need a very good network interface to do that kind of job!
>>>> Add 30.000 channels / RTP ports to your media server and you get a whole lot of data going on in your network. I bet even the UTP5 cables won't handle the heat   =:o)
>>>>
>>>> Also, check the RTP port range your media server was configured with.
>>>> On Asterisk, usually ports 10.000 to 20.000 are set, which is about 10.000 calls. In the above example, you would stop receiving calls at 2minutes because Asterisk has all RTP ports busy/in use!
>>>> I don't know about other media servers, but I would bet this is pretty much the same...
>>>>
>>>> Hope this helps!
>>>>
>>>>
>>>> Sérgio Charrua
>>>>
>>>>
>>>> www.voip.pt<http://www.voip.pt>
>>>> Tel.: +351 21 130 71 77
>>>>
>>>> Email : sergio.charrua at voip.pt<mailto:sergio.charrua at voip.pt>
>>>>
>>>> This message and any files or documents attached are strictly confidential or otherwise legally protected.
>>>>
>>>> It is intended only for the individual or entity named. If you are not the named addressee or have received this email in error, please inform the sender immediately, delete it from your system and do not copy or disclose it or its contents or use it for any purpose. Please also note that transmission cannot be guaranteed to be secure or error-free.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Dec 21, 2021 at 11:54 AM pwerspire <pwerspire at gmail.com<mailto:pwerspire at gmail.com>> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> I have been doing some load testing with Kamailio and having some issues.
>>>>>
>>>>> I have been trying with 100 CPS and at the beginning, everything is working well but after some time (it can be 10 minutes or for example 40 minutes, is just random but normally happens more in the first 10 minutes) Kamailio stop replying to all SIP messages but still processing HTTP requests, some commands, etc.
>>>>>
>>>>> If I use  "kamcmd dlg.list" no output happens and after that, all kamcmd commands just keep loading with no output.
>>>>>
>>>>> Kamailio is sharing Dialogs and htables using DMQ with other Kamailio that is the failover, if I shut down the failover one (so no DMQ replication), the test works well with the 100 CPS.
>>>>>
>>>>> Also tried with modparam("dmq", "worker_usleep", 1000) but the behavior is the same, it will stop processing traffic.
>>>>>
>>>>> This is some of configuration used:
>>>>>
>>>>> # ----------------- setting module-specific parameters ---------------
>>>>> modparam("dmq", "server_address", "sip:INTERNAL_INSTANCE_IP:5060")
>>>>> modparam("dmq", "notification_address", "DMQ_NOTIFICATION_ADDRESS")
>>>>>
>>>>> modparam("dmq", "multi_notify", 1)
>>>>> modparam("dmq", "ping_interval", 10)
>>>>> modparam("dmq", "num_workers",4)
>>>>>
>>>>>
>>>>> modparam("htable", "enable_dmq", 1)
>>>>> modparam("htable", "dmq_init_sync", 1)
>>>>>
>>>>>
>>>>> # ----- dialog params -----
>>>>> modparam("dialog", "dlg_flag", FLD_DLG)
>>>>> modparam("dialog", "dlg_match_mode", 1)
>>>>> modparam("dialog", "db_url", DBURL_RW)
>>>>> modparam("dialog", "db_mode", 0)
>>>>> modparam("dialog", "enable_dmq", 1)
>>>>> modparam("dialog", "db_update_period", 10)
>>>>> modparam("dialog", "h_id_start", H_ID_START)
>>>>> modparam("dialog", "h_id_step", H_ID_STEP)
>>>>>
>>>>>  Memory:
>>>>>
>>>>> Shared: 4096
>>>>> Private: 512
>>>>>
>>>>> kamailio -v
>>>>> version: kamailio 5.5.3 (x86_64/linux) 473cef
>>>>> flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
>>>>> ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
>>>>> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
>>>>> id: 473cef
>>>>> compiled on 09:34:57 Dec 20 2021 with gcc 10.2.1
>>>>>
>>>>>
>>>>> In attach is the trap collected after the issue happens.
>>>>> Any more logs or configurations that can help identify or solve the issue?
>>>>>
>>>>> Thanks for the help,
>>>>> Regards,
>>>>> Tiago
>>>>> __________________________________________________________
>>>>> Kamailio - Users Mailing List - Non Commercial Discussions
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>>>>
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--
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