[asterisk-users] asterisk and Hyper-V

[Dmitriy Ermakov]

I am using CentOS 6, kernel 3.10 from elrepo.org kernels
(3.10.102-1.el6.elrepo.x86_64).
Asterisk version is 11.21.2 and Asterisk 13.X.X (I can't get it's
version now).

Is it possible that your network switches' interfaces which are
connected to Hyper-V Server are 100% busy?
It is possible that my installation works well because my Hyper-V server
is not high-load server so it has plenty free CPU, Disk, Memory, Network
resources to give them to Asterisk VM.

Kseniya, could you try to reserve 100% of virtual CPUs for Asterisk VM
(just to test this configuration)?


I am sorry I don't have free hardware and time to test your Ubuntu 16,
asterisk 13.1, kernel 4.4.0-104 configuration(

On 18 Dec 2017 12:09 p.m., "Kseniya Blashchuk" <ksyblast at gmail.com
<mailto:ksyblast at gmail.com>> wrote:

    Dmitry, are you using CentOS? What kernel version are you using? I
    will try with the same to see if it can be also a kernel-related issue.

    пн, 18 дек. 2017 г. в 11:35, Kseniya Blashchuk <ksyblast at gmail.com
    <mailto:ksyblast at gmail.com>>:

        Thank you for a quick answer, Dmitry!

        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 :(. 

        пн, 18 дек. 2017 г. в 10:49, Dmitriy Ermakov
        <demonihin at gmail.com <mailto:demonihin at gmail.com>>:

            Hi, Kseniya!

            I have three installations of Asterisk (as FreePBX but I
            think it is not important). They work fine.

            I have made some settings in Asterisk and Hyper-V:

            Asterisk: timing interface - timerfd.

            Hyper-V:

             1. Virtual Machine => Network Adapter => Hardware
                Acceleration => Virtual Machine Queue - Disable it;
             2. 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;
             3. Virtual Machine => Integration Services => Time
                synchronisation - enable it.

            This settings helped me.

            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.


            On 12/18/2017 10:26 AM, Kseniya Blashchuk wrote:
>             Hi all!
>             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.
>             Does anybody have a working setup with Hyper-V?
>
>
>

            -- 
            С уважением, Дмитрий Ермаков

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