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?<span></span><br><br>On Thursday, June 4, 2015, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Michael, as far as I understand it, it works as follows:<br>
<br>
timerfd is a kernel's means of providing the system clock to the<br>
userland process (freeswitch daemon in our case).<br>
<br>
The kernel takes the clock from one of available sources, and these<br>
sources are either physical or software clocks:<br>
<br>
# cat /sys/devices/system/clocksource/clocksource0/available_clocksource<br>
tsc hpet acpi_pm<br>
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource<br>
tsc<br>
<br>
So, TSC was giving stable results, while HPET, although expected to be<br>
more precise, was generating errors while the CPU was busy with other<br>
jobs.<br>
<br>
<br>
<br>
<br>
<br>
<br>
On Thu, Jun 4, 2015 at 9:05 PM, Michael Jerris <<a href="javascript:;" onclick="_e(event, 'cvml', 'mike@jerris.com')">mike@jerris.com</a>> wrote:<br>
> timerfd would be the preferred timing source on any remotely modern linux kernel<br>
><br>
>> On Jun 4, 2015, at 6:47 AM, Stanislav Sinyagin <<a href="javascript:;" onclick="_e(event, 'cvml', 'ssinyagin@gmail.com')">ssinyagin@gmail.com</a>> wrote:<br>
>><br>
>> I summarized some experience gained in a customer project, hopefully<br>
>> it will be useful:<br>
>> <a href="https://txlab.wordpress.com/2015/06/02/quality-assurance-for-voip-calls-2/" target="_blank">https://txlab.wordpress.com/2015/06/02/quality-assurance-for-voip-calls-2/</a><br>
>><br>
>> @Anthony, you suggested to use HPET timer for better precision, but it<br>
>> appears that it is affected by the CPU load: while the debian package<br>
>> build script was running, the quality of recorded calls has degraded<br>
>> -- even that the recording was done onto a TMPFS partition. With the<br>
>> default TSC timer, this was not the case.<br>
>><br>
><br>
><br>
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</blockquote>