Re: [SR-Users] Seeing Large Waits

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@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-performan...

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/ support: +888-907-2085 dSIPRouter http://dsiprouter.org/ - GUI focused on implementing Kamailio to provide SIP Trunking and PBX Hosting Services

...

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-- Alex Balashov | Principal | Evariste Systems LLC

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