Re: [SR-Users] SIP Server Hardware or VM ??

[Daniel Tryba]

On Wed, May 23, 2018 at 02:57:57PM +, Pinter, Gerd. wrote:
> Thank you very much, this underpins my consideration.
> How to tell my Boss :o  

Since I wasn't explicit in my reply: we are running rtpengine in vmware.
The test I did bare metal vs. vmware was to confirm there is no problem
with vmware guests if you limit the amount of traffic per instance and
make sure not to overprovision.

Sure rtpengine on bare metal will be better since there is no resource
contention, but in my case that would mean multiple dedicated machines in
multiple datacentra essentially wasting 90% of resources ideling.


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Re: [SR-Users] SIP Server Hardware or VM ??

[Henning Westerholt]

Am Mittwoch, 23. Mai 2018, 16:57:57 CEST schrieb Pinter, Gerd.:
> Thank you very much, this underpins my consideration.
> How to tell my Boss :o  
> 
> Nice Regards

Hello Gerd,

to help to convince your boss I would try to underline your thoughts with some 
measurements. 

Something like this: if you get higher load on the e.g. VMWare Vcenter physical 
machines, 
then the jitter also increases etc.. Maybe you can test this during a time 
where the effect is 
also not that visible.

Maybe the talk from Alex Balashov at this year Kamailio World (available on 
youtube) 
about cloud environment restrictions and other things is also interesting for 
you, to give 
some arguments.

Best regards,

Henning
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Re: [SR-Users] SIP Server Hardware or VM ??

[Pinter, Gerd.]

Thank you very much, this underpins my consideration.
How to tell my Boss :o  

Nice Regards

Gerd





-Ursprüngliche Nachricht-
Von: sr-users <sr-users-boun...@lists.kamailio.org> Im Auftrag von Daniel Tryba
Gesendet: Mittwoch, 23. Mai 2018 16:03
An: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Betreff: Re: [SR-Users] SIP Server Hardware or VM ??

On Wed, May 23, 2018 at 01:25:58PM +, Pinter, Gerd. wrote:
> The question is, if anyone has experience if this issue maybe can be 
> solved by running the Sip Server on a standalone hardware plugged into 
> network Port on our Hardware Firewall, instead of a virtual Machine 
> running on VM with virtual switches and so on. The current SIP Server 
> has a Public IP Address, but all the Traffic runs thru Firewall, VPN, 
> Hardware Switches and Virtual Switches. What you think?

Virtualisation can/will add some jitter, but if you configure your setup 
correctly it will work fine for normal phone calls [*]. For example in VMware 
there is something caller NIC interrupt coalescing. AFAIK this is enable by 
default but introduces latency for RTP streams.

But have bare hardware with a rtpproxy will perform better, without any tuning 
a recent machine relayed 900Mbit/s (simulated RTP packets) with ease, running 
vmware a single cpu guest instance was limited to about 40Mbit/s, 2 CPUs in the 
guest topped out at  about 90Mbit/s before jitter and eventual loss occured 
(with coalescing disabled).

*: jitter introduced by rtpengine is negligible compared to the jitter 
introduced by the endpoints themselves (either devices or network setup).

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Re: [SR-Users] SIP Server Hardware or VM ??

[Mikko Lehto]

Pinter, Gerd.  wrote:

> Since we encountered problems with connections via mobile Networks we set up 
> our SIP Server as RTP Proxy which resolved all those multiple NAT issues. But 
> on the other hand we pay for that with a higher jitter rate. The question is, 
> if anyone has experience if this issue maybe can be solved by running the Sip 
> Server on a standalone hardware plugged into network Port on our Hardware 
> Firewall, instead of a virtual Machine running on VM with virtual switches 
> and so on. The current SIP Server has a Public IP Address, but all the 
> Traffic runs thru Firewall, VPN, Hardware Switches and Virtual Switches. What 
> you think?
 

Hi

Are you asking if RTP proxy can work in some other node
than the same where Kamailio SIP proxy instance is running?

If so, answer to that is yes. See rtpproxy module parameter rtpproxy_sock:
http://kamailio.org/docs/modules/5.1.x/modules/rtpproxy.html#rtpproxy.p.rtpproxy_sock

With that parameter you can set RTP proxy in HW and still have SIP proxy in VM.


If on the other hand you are asking about resource management to gain
better jitter and such in virtual environment, then I have no clue.

Hope this helps

-- 
Mikko

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