[SR-Users] Increase MAX_BRANCHES_LIMIT

[Henning Westerholt]

Hi Daniel,

thanks for the clarification, I was seeing that it’s used in TM, but did not check about the allocation/internal data structure topic.

Cheers,

Henning

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From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Daniel-Constantin Mierla
Sent: Monday, December 12, 2022 8:32 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Increase MAX_BRANCHES_LIMIT


Hello,

this suggestion to increase MAX_BRANCHES_LIMIT is wrong, its value is constrained to be 32 because of some tm internals which uses a 32 bitmap for cancelled branches in transactions. Might be used for other things, this came in my mind without looking at the code. Going over 32 will require changes in tm module, otherwise it will result in malfunctioning/crashes.

Also, MAX_BRANCHES_LIMIT alone has no impact in memory usage, that is a matter of the global parameter max_branches, MAX_BRANCHES_LIMIT is only used to check that does not exceed it.

Cheers,
Daniel
On 12.12.22 08:14, Henning Westerholt wrote:
Hello,

you are right, the maximum setting is still the compile time value. The default value for max_branches is 12.

Regarding the increase, the obvious advice applies, just raise it that much as you need. It will increase memory usage for transaction and decrease some run-time performance. But if you are not getting excessive, it should be ok.

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><mailto:sr-users-bounces at lists.kamailio.org> On Behalf Of Lars Jansson
Sent: Sunday, December 11, 2022 8:24 PM
To: sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Increase MAX_BRANCHES_LIMIT


Hi Patrick,

Thanks for your reply. I'm aware of the max_branches parameter in the config file, but my understanding from trial and error is that the bounds of the max_branches parameter is set by MAX_BRANCHES_LIMIT in config.h.

Regards,
Lars
Den 2022-12-10 kl. 14:55, skrev Patrick Karton:
Hello
there is already max_branches parameter you can set in config file.

Le 10 déc. 2022 13:02, Lars Jansson <lars.jansson at solstiernan.nu><mailto:lars.jansson at solstiernan.nu> a écrit :

Hi,

I am building a configuration script where for some traffic flows parallel forking will be needed, and in this case I need to go beyond the default max limit of the max amount of branches.

Apart from this specific case the traffic load that kamailio will need to handle is very low, let's say just one second here and there with up to 5 concurrent calls at most.

This limit is as far as I understand set here: usr/local/src/kamailio-5.6/kamailio/src/core/config.h

And the default limit is:
#define MAX_BRANCHES_LIMIT              32      /*!< limit of maximum number of branches per transaction */

Here are the questions I have related to this:

1) If I increase the value of this constant in config.h, how high is it reasonable to set this value and still have a stable system?

2) If I increase MAX_BRANCHES_LIMIT beyond 32, are there also other parameters that needs to be changed for the system to be able to cope, and if so which parameters?

Regards,
Lars





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