[OpenSIPS-Users] Max TCP connections

[Ali Pey]

Thanks Muhammad. These are great information. Thank you sharing it with us.

Two follow up questions:
1- What tool did you use to send registers over TCP and keep connections
open?
2- What did you set tcp_max_connections to in opensips?

Regards,
Ali Pey


On Sat, Sep 29, 2012 at 10:59 AM, Muhammad Shahzad <
shaheryarkh at googlemail.com> wrote:

> Every thing is a file in UNIX / Linux, so every TCP connection is a file
> too. Also persistent connects are sometime memory intensive too. So make
> sure adjust following things carefully.
>
> 1. Number of Open Files Limit, use either ulimit -n <number> in opensips
> startup script or set open_files_limit in global section on opensips dial
> plan. I usually use second options and set open_files_limit to 1024000.
> 2. Increase TCP children, tcp_children, default is i think 8, increase it
> to 16 or even 32 if you have very large deployment, this will speed up
> connection processing significantly, however consume much more memory. Also
> make sure to set all other TCP related opensips variables to reasonable
> values, such as tcp_connect_timeout, tcp_connection_lifetime etc. etc. Look
> here for details,
>
> http://www.opensips.org/Resources/DocsCoreFcn18#toc75
>
> 3. If you have a dedicated SIP server, running only OpenSIPs then reduce
> stack size as well. I found setting it to 1024KB or even less gives good
> results.
>
> Now some practical results. On Dell server R510 with 8GB RAM and 2.4GHz
> quad core Intel processor I was able to test 104,981 concurrent SIP
> registrations with load average between 1.0 to 1.5.
>
> Two important things to remember.
>
> 1. What is estimated / expected number of requests per second?
> 2. What is SIP re-register time?
>
> For me, i tested up to 350 requests per second with re-register time as
> 300 seconds this gives theoretically possible concurrent SIP connections to
> 350 x 300 = 105,000. Which means you can't have more then this number of
> concurrent connections. So i can safely say per my testing that opensips
> can practically handle up to ~100K SIP concurrent connections.
>
> Thank you.
>
>
> On Fri, Sep 28, 2012 at 7:21 PM, Ali Pey <alipey at gmail.com> wrote:
>
>> I am also interested in this. Any responds/updates?
>>
>> Regards,
>> Ali Pey
>>
>>
>> On Wed, Sep 12, 2012 at 9:34 AM, John Quick <john.quick at smartvox.co.uk>wrote:
>>
>>> Does anyone know what the practical limit is for the maximum number of
>>> TCP
>>> connections to OpenSIPS?
>>> It is a question that often comes up with clients who are developing
>>> SIP-based apps for smart phones. Persistent TCP seems to be strongly
>>> favoured over UDP for connections with mobile devices such as iPhone,
>>> iPad,
>>> etc. However, I cannot even get OpenSIPS to start if I set
>>> tcp_max_connections to a number greater than about 55000. Have tried it
>>> with
>>> v1.7 and 1.8. Is there a way to overcome this ceiling? Has anyone tested
>>> it
>>> with 10's of thousands of TCP connections?
>>>
>>> John Quick
>>> Smartvox Limited
>>>
>>>
>>>
>>>
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>>>
>>
>>
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>>
>
>
> --
> Muhammad Shahzad
> -----------------------------------
> CISCO Rich Media Communication Specialist (CRMCS)
> CISCO Certified Network Associate (CCNA)
> Cell: +92 334 422 40 88
> MSN: shari_786pk at hotmail.com
> Email: shaheryarkh at googlemail.com
>
>
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