[Freeswitch-users] Call quality assurance

[Michael Jerris]

On Debian we don't explicitly set it

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

> it's standard latest Debian 7 on a 8-core Xeon.
>
> Did you explicitly use HPET clock before?
>
>
>
> On Fri, Jun 5, 2015 at 12:36 AM, Michael Jerris <mike at jerris.com
> <javascript:;>> wrote:
> > 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
> <javascript:;>> 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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