[SR-Users] TCP read/write buffer size on per connection or per module basis

[M S]

OK. Thank you for detailed answer.

Let me discuss it internally and see what is best way to deal with it. If
possible I will try to write up a patch for per socket tcp buffer sizes and
submit it to you guys for inclusion in kamailio trunk.

Thank you.



On Tue, May 2, 2017 at 3:19 PM, Daniel-Constantin Mierla <miconda at gmail.com>
wrote:

> Hello,
>
>
> On 02.05.17 13:02, M S wrote:
> > Hi,
> >
> > I have a kamailio v4.4.5 deployment that serves TCP clients for SIP
> > and XCAP requests (without SIP presence). The kamailio's core TCP
> > parameters allow us to set TCP read and write buffer sizes which are
> > set globally for all TCP connections.
> >
> > However, i noticed that in general SIP over TCP request is much
> > smaller (<8KB for audio + video SIP INVITE request) then XCAP requests
> > (say to support up to 500 contacts we need TCP buffers =~ 64KB).
> >
> > So, if I set global TCP buffer size according to XCAP service needs
> > (e.g. 64KB), they waste too much RAM for SIP connections (assuming max
> > SIP packet is  8KB, there is 56KB buffer space wasted per connection).
> >
> > On the other hand, if i set global TCP buffer sizes to SIP service
> > needs (e.g. 8KB) then it is insufficient for XCAP (only 70-80 contacts
> > would fix in XCAP list).
> >
> > Therefore, i am looking for a way to allow TCP buffer size settings
> > per connection OR per module basis. Is it possible? If so then how?
> at this moment is not possible to set the buffer size per connection.
> The connection structure is created before knowing what is going to be
> received on it.
>
> Also, not per module, because the module is agnostic of the transport
> layer.
>
> An enhancement might be to specify it per socket, so when listening on
> port 5060, then use a specific buffer size and when listening on another
> port like 8060, use a different buffer size. But this requires C coding.
>
> On the other hand, the latest kernels use the physical memory only when
> writing. So if one allocates 2GB and uses only 10MB, only 10MB are used
> from the physical memory, the rest is just virtual memory.
>
> Cheers,
> Daniel
>
> --
> Daniel-Constantin Mierla
> www.twitter.com/miconda -- www.linkedin.com/in/miconda
> Kamailio Advanced Training - May 22-24 (USA) - www.asipto.com
> Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com
>
>
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