[Freeswitch-users] KVM vs. XEN virtualization

[Sergey Safarov]

Stanislav, I use vmware esxi. I am not have problems like you has described.

On Sat, Apr 4, 2015, 03:18 Stanislav Sinyagin <ssinyagin at gmail.com> wrote:

> hi,
>
> Here are some test results which might be interesting:
>
> I've set up a test FreeSWITCH server at digitalocean (they use KVM),
> and originated test calls to some ITSP accounts. Each call played a
> test sound file (voice samples from ITU:
> http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050
> ), and on the receiving end another FreeSWITCH server was recording
> the received session. The receiving server was on a XEN VM. Both
> servers talked G711 to their corresponding ITSP accounts.
>
> Then I compared the source audio and received audio in Audacity editor.
>
> The tests showed that the received voice wave shifts 20ms from the
> original sound every few seconds, randomly back and forward. This
> skewing was always present, regardless of ITSP and time of day.
>
> Then I moved the sending server to a XEN VM, and the waves appeared
> almost perfectly synchronized (there was a 5ms skew in one test, and I
> guess it's related to transcoding buffer, as the sound was obviously
> transcoded).
>
> The effect was always visible with a 30-second sample, and I also made
> additional tests with 2-minute samples.
>
> It would also be interesting to test this from a VmWare VM. If someone
> wants to run such a test, feel free to contact me directly.
>
>
> cheers,
> stan
>
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