[SR-Users] Seeing Large Waits

[Mack Hendricks]

Hey Alex,

Thanks for the insight. I remember reading your article before and it was super helpful. I think we disabled all of the heavy database operations, but I will double check.

We are building the RURI using the cfg_rpc module, so we aren’t hitting a database.   We have a failure route that causes another RURI to be created, which sends the call to a Freeswitch server to play a message.

Let me know if you see any issue with this, I will double check the database calls to be safe.

Sent from my iPhone

> On May 2, 2018, at 11:36 PM, Alex Balashov <abalashov at evaristesys.com> wrote:
> 
> Hi Mack,
> 
> What sort of end-to-end delays are you seeing, from receipt of request
> until immediately before t_relay()?
> 
> You can profile this with the benchmark module:
> 
>   https://kamailio.org/docs/modules/5.1.x/modules/benchmark.html
> 
> Or my preferred method, the hard way:
> 
>        # At the practical start of request processing.
> 
>        $avp(proc_start) = $TV(Sn);
> 
>        # At the end, right before calling t_relay() or forward().
> 
>        $var(cur_time) = $TV(Sn);
> 
>        $var(proc_diff) = (
>                (((
>                  $(var(cur_time){s.select,0,.}{s.int}) -
>                  $(avp(proc_start){s.select,0,.}{s.int})
>                ) * 1000000)
>                +
>                (
>                 $(var(cur_time){s.select,1,.}{s.int}) -
>                 $(avp(proc_start){s.select,1,.}{s.int})
>                ) / 1000) mod 1000
>        );
> 
>        xlog("L_INFO", "[R-MAIN:$ci] -> Request processing delay: $var(proc_diff) ms\n"););
> 
> Also, for general background on this topic, you might consider my
> article on the subject of Kamailio performance characteristics:
> 
>   http://blog.csrpswitch.com/tuning-kamailio-for-high-throughput-and-performance/
> 
> If I had to guess, shooting from the hip, you've got some really slow
> database queries somewhere.
> 
> -- Alex
> 
>> On Wed, May 02, 2018 at 06:19:00PM -0400, Mack Hendricks wrote:
>> 
>> Hey All,
>> 
>> We are load testing Kamailio 4.2.3 and we are seeing the waiting within the transaction manager increasing.   I’ve increased the children from 8 to 16 to 24, but we are still seeing a large amount of waiting.  I don’t see an errors in the logs.   Can anyone give me a clue on where to look. 
>> 
>> 05-02-18_03:07:38 PM
>> tm.stats
>> {
>>        current: 390
>>        waiting: 226
>>        total: 2361
>>        total_local: 0
>>        replied_locally: 1406
>>        6xx: 0
>>        5xx: 0
>>        4xx: 88
>>        3xx: 0
>>        2xx: 3180
>>        created: 2361
>>        freed: 1971
>>        delayed_free: 0
>> }
>> 
>> Mack Hendricks / Head of Support / dOpenSource
>> web: http://dopensource.com <http://dopensource.com/>
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> 
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> 
> 
> -- 
> Alex Balashov | Principal | Evariste Systems LLC
> 
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/