[asterisk-users] asterisk and Hyper-V

[Kseniya Blashchuk]

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>:

> 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>:
>
>> 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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