<div dir="ltr">Thank you for a quick answer, Dmitry!<div><br></div><div>We have tried the settings you suggested but nothing helped. The machine is running 4.4.0-104 kernel, 4 cores, Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz, clocksource is hyperv_clocksource_tsc_page, timing module is res_timing_timerfd.so. We have also tried to set 50% Reserve - no luck :(. </div></div><br><div class="gmail_quote"><div dir="ltr">пн, 18 дек. 2017 г. в 10:49, Dmitriy Ermakov <<a href="mailto:demonihin@gmail.com">demonihin@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi, Kseniya!</p>
<p>I have three installations of Asterisk (as FreePBX but I think it
is not important). They work fine.</p>
<p>I have made some settings in Asterisk and Hyper-V:</p>
<p>Asterisk: timing interface - timerfd.</p>
<p>Hyper-V:</p>
<ol>
<li>Virtual Machine => Network Adapter => Hardware
Acceleration => Virtual Machine Queue - Disable it;</li>
<li>Virtual Machine => Processor => Virtual Machine Reserve
(percentage) - set at least 25% (if you have 4 virtual cores for
your Asterisk). You can try to set reserve more or less then 25%
- test it and, please, send email here;</li>
<li>Virtual Machine => Integration Services => Time
synchronisation - enable it.<br>
</li>
</ol>
<p> This settings helped me.</p>
<p>Also check your Linux Kernel version - it must be 3.10 or newer.
I saw very bad "timing test" results on kernel 2.6.32.<br>
</p></div><div text="#000000" bgcolor="#FFFFFF">
<br>
<div class="m_-6849995180857981132moz-cite-prefix">On 12/18/2017 10:26 AM, Kseniya
Blashchuk wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi all!
<div>Does anybody have experience with asterisk on Hyper-V? My
test setup with Ubuntu 16 and asterisk 13.1 (ubuntu repo)
shows sound distortion. I have analyzed the RTP flow with
wireshark and I see high skew and delta values when the
traffic leaves the hypervisor, however everything is okay when
a capture is taken from a VM itself. I have read that there
can be timing problems with Hyper-V. I have tried to disable
time sync with the machine and tried different clocksources. I
have also tried to change asterisk timing interface to dahdi
(dummy) - nothing helped so far. Hyper-V version is 12p2.</div>
<div>Does anybody have a working setup with Hyper-V?</div>
<div><br>
</div>
</div>
<br>
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<br>
</blockquote>
<br>
</div><div text="#000000" bgcolor="#FFFFFF"><pre class="m_-6849995180857981132moz-signature" cols="72">--
С уважением, Дмитрий Ермаков</pre>
</div>
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