[Freeswitch-users] Call quality assurance

[Michael Jerris]

To be completely honest on non vm setups I haven't seen anyone with
problems like this on reasonably recent kernels.  Are you using a distro
with an older kernel?

On Thursday, June 4, 2015, Stanislav Sinyagin <ssinyagin at gmail.com> wrote:

> Michael, as far as I understand it, it works as follows:
>
> timerfd is a kernel's means of providing the system clock to the
> userland process (freeswitch daemon in our case).
>
> The kernel takes the clock from one of available sources, and these
> sources are either physical or software clocks:
>
> # cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> tsc hpet acpi_pm
> # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> tsc
>
> So, TSC was giving stable results, while HPET, although expected to be
> more precise, was generating errors while the CPU was busy with other
> jobs.
>
>
>
>
>
>
> On Thu, Jun 4, 2015 at 9:05 PM, Michael Jerris <mike at jerris.com
> <javascript:;>> wrote:
> > timerfd would be the preferred timing source on any remotely modern
> linux kernel
> >
> >> On Jun 4, 2015, at 6:47 AM, Stanislav Sinyagin <ssinyagin at gmail.com
> <javascript:;>> wrote:
> >>
> >> I summarized some experience gained in a customer project, hopefully
> >> it will be useful:
> >>
> https://txlab.wordpress.com/2015/06/02/quality-assurance-for-voip-calls-2/
> >>
> >> @Anthony, you suggested to use HPET timer for better precision, but it
> >> appears that it is affected by the CPU load: while the debian package
> >> build script was running, the quality of recorded calls has degraded
> >> -- even that the recording was done onto a TMPFS partition. With the
> >> default TSC timer, this was not the case.
> >>
> >
> >
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>
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>
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