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

Thu Jul 28 15:52:33 MSD 2011

> Peter, thanks for those details.

What sort of trade-offs, if any, are useful to improve audio for conferences and IVRs on VMs? Will increasing the interval setting for a conference help? What about using larger frames for codecs? I know that latency, beyond a point, is a serious quality issue of its own. Still, do you know what compromises provide the best improvement?

Bryan

> On 7/28/11, Peter Olsson <peter.olsson at visionutveckling.se> wrote:
>> 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] f&#246;r 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
>>>> 
>>>> FreeSWITCH-users mailing list
>>>> FreeSWITCH-users at lists.freeswitch.org
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>>>> 
>>>> 
>>> 
>>> _______________________________________________
>>> Join us at ClueCon 2011, Aug 9-11, Chicago
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>> 
>> --
>> Sent from my mobile device
>> 
>> Sincerely,
>> 
>> Giovanni Maruzzelli
>> Cell : +39-347-2665618
>> 
>> _______________________________________________
>> Join us at ClueCon 2011, Aug 9-11, Chicago
>> http://www.cluecon.com 877-7-4ACLUE
>> 
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>> 
>> 
>> _______________________________________________
>> Join us at ClueCon 2011, Aug 9-11, Chicago
>> http://www.cluecon.com 877-7-4ACLUE
>> 
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> 
> -- 
> Sent from my mobile device
> 
> Sincerely,
> 
> Giovanni Maruzzelli
> Cell : +39-347-2665618
> 
> _______________________________________________
> Join us at ClueCon 2011, Aug 9-11, Chicago
> http://www.cluecon.com 877-7-4ACLUE
> 
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