[Freeswitch-users] Bad sound quality and Abnormally large timer gap 100953 detected!

[Peter Olsson]

I feel I need to explain my last statement a little further :)

First of all, you can run FS on virtual machines (even though I never recommend it), but you need to be in control of the virtual environment, or totally trust the ones controlling it.

There are two basic problems when running on virtual hardware - timing and network I/O. For timing to work you need to make sure that the one controlling the virtual environment NEVER give out more CPU cores then there are available on the hardware. If they give out more, and your machine need to share resources with another machine, you will be in trouble. As soon as the other virtual machine starts to load the CPU, your machine will get bad timing. Also - usually a one core VM will get better timing then a two+ core VM.

Also, to be safe on the network side, you need your own NIC, that is not shared with other machines.

If you feel you can control this, you might be successful with the setup, if you can't control this, you're either lucky (and things work anyway), or you'll get bad audio.

Also, just passing RTP for normal call isn't the most critical issue (you don't even have to use a timer there), the most critical timing issues will occur in conferences or when using a local IVR on the machine.

I've done lots of testing for this in my lab, since many of my customers wants to run our system (which uses FS for IVR/conferencing) on ESXi virtual hosts, and I've found the above to be quite critical to succeed with your virtual implementation.

/Peter

____________________________
Från: freeswitch-users-bounces at lists.freeswitch.org [freeswitch-users-bounces at lists.freeswitch.org] för Giovanni Maruzzelli [gmaruzz at gmail.com]
Skickat: den 28 juli 2011 09:37
Till: FreeSWITCH Users Help
Ämne: Re: [Freeswitch-users] Bad sound quality and Abnormally large timer gap 100953 detected!

Hey guys 'n gal,

the original post is asking for Windows!!!

-giovanni


On 7/28/11, Sam <lakersman2006 at yahoo.com> wrote:
> i forgot to mention that the 50 to 60 calls also are doing majority of g729
> transcoding as well which does put th cpu to 85 to 90% full utilization. So
> don't knock virtual machines.
>
>
>
> ________________________________
> From: Avi Marcus <avi at avimarcus.net>
> To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> Sent: Wednesday, July 27, 2011 3:20 PM
> Subject: Re: [Freeswitch-users] Bad sound quality and Abnormally large timer
> gap 100953 detected!
>
>
> I'm running FS under Xen provided by Linode. I only run max 10 concurrent
> channels in production, but an MOH test sounded good through 200 concurrent
> channels.
> Linode says the CPU is the most underused resource on their systems...
>
>
> -Avi
>
>
> On Thu, Jul 28, 2011 at 12:57 AM, Michael Collins <msc at freeswitch.org>
> wrote:
>
>
>>
>>
>>On Wed, Jul 27, 2011 at 2:24 PM, Sam <lakersman2006 at yahoo.com> wrote:
>>
>>I run Asterisk on a virtual machine and it runs quite well even with
>> approximately 50 to 60 simultaneous callers and tha'ts even with media
>> passing thru it.
>>>
>>That's actually pretty impressive. What version of Asterisk do you use? And
>> do you have to continually make sacrifices to the digital gods to keep
>> them appeased? :P
>>
>>-MC
>>_______________________________________________
>>Join us at ClueCon 2011, Aug 9-11, Chicago
>>http://www.cluecon.com 877-7-4ACLUE
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>
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--
Sent from my mobile device

Sincerely,

Giovanni Maruzzelli
Cell : +39-347-2665618

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