[OpenSIPS-Users] Max TCP connections

[Muhammad Shahzad]

For udp i used sipp and for tcp i used libnet-sip-perl. I think tcp max
connections was 819200, max open files was 1024000. Also i used 6 machines
to produce this load. The test lasted 30 minutes.

Thank you.

On Oct 1, 2012 6:13 PM, "Ali Pey" <alipey at gmail.com> wrote:
>
> 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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>
>
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