<div dir="ltr">Robert,<div><br></div><div>While I'd love to see VMs provide more stable ground for FS, it's simply not the best task for a VM. Virtual machines scale well specifically because you can overprovision them. It would not be nearly as cost-effective to run VMs if each instance had a guaranteed dedicated slice of hardware to operate on. While hypervisors are <i>very</i> good at task prioritization, they're not perfect. If the hypervisor can't schedule processor time when FS needs it because the CPU cores are momentarily taken on other tasks, there's not a whole lot FS can do. This is not an issue with just FS, but with all real-time applications. In most apps, even large clock skews and bad hypervisors schedulers can go completely unnoticed. If there's consistent 5-10ms every time you click to load a web page, you'd probably have no idea. If there's 5-10ms jitter every time you try to read 20ms of audio, you have <i>really bad</i> audio. Granted most skews are not that bad, but the effects are pronounced when you're dealing with data that's real-time in nature.</div><div><br></div><div>Bilal,</div><div><br></div><div>I have no idea what AMI you're running, but a very rough "ear test" has made me fairly confident that I can get better performance running AmazonLinux AMIs over Ubuntu (and probably many others). It wouldn't surprise me if AmazonLinux builds a custom kernel that has been tuned to run better on AWS hardware. I'd say it's at least worth a quick experiment.</div><div><br></div><div>Best,</div><div>Colin</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 14, 2017 at 4:34 PM, Mundkowsky, Robert <span dir="ltr"><<a href="mailto:rmundkowsky@ets.org" target="_blank">rmundkowsky@ets.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><a name="m_-5335504817902696112__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Michael<u></u><u></u></span></a></p>
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<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Just curious, why so many problems with VMs?<u></u><u></u></span></p>
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<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I would think most applications need real time clocks that provide consistent valid data?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Bilal,<u></u><u></u></span></p>
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<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">you might try a larger AWS instance to make sure your are getting 100% of the box; might help some.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Robert
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@<wbr>lists.freeswitch.org</a> [mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-<wbr>bounces@lists.freeswitch.org</a>]
<b>On Behalf Of </b>Michael Jerris<br>
<b>Sent:</b> Friday, April 14, 2017 4:25 PM<br>
<b>To:</b> FreeSWITCH Users Help <<a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.<wbr>freeswitch.org</a>><br>
<b>Subject:</b> Re: [Freeswitch-users] Choppy audio when conferencing 4+ participants<u></u><u></u></span></p>
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<p class="MsoNormal">can you reproduce the same issue on real hardware? We’ve seen all kinds of weird timing issues that could account for this running on aws.<u></u><u></u></p>
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<p class="MsoNormal">On Apr 14, 2017, at 4:16 PM, Bilal Dar <<a href="mailto:bilal@rgate-systems.com" target="_blank">bilal@rgate-systems.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Its an AWS <span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">m3.2xlarge instance.</span><u></u><u></u></p>
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<p class="MsoNormal">On Fri, Apr 14, 2017 at 9:57 AM, Michael Jerris <<a href="mailto:mike@jerris.com" target="_blank">mike@jerris.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Real hardware or VM?<br>
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> On Apr 14, 2017, at 12:48 PM, Bilal Dar <<a href="mailto:bilal@rgate-systems.com" target="_blank">bilal@rgate-systems.com</a>> wrote:<br>
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> I have been struggling with an issue for almost 2 weeks.<br>
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> Our regular calls have no quality issue and looking RTCP statistics network conditions are perfect. We have normally on peak hr 60 calls and around 10 conferences.<br>
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> We have noticed that when we have 2 conferences of 4 or 5 participants, audio starts breaking for the users who are on conference. Regular calls do not experience any quality degradation.<br>
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> I upgraded the server to specs of 30Gig memory and 8 vCPU but still the issue exists. Common thing I have noticed even during off-peak hrs is that two 4+ participant call can cause the issue.<br>
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> I have ruled out network & hardware. Last change I made was moved all users to G.711 from G.722. Now I am not sure what other steps I can take. Appreciate any suggestions.<u></u><u></u></p>
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