[Freeswitch-users] Call quality assurance

[I put the Who? in Mishehu]

Does Debian 7 allow for mmap of the HPET?  I have seen this option in 
the kernels for some time, and I could speculate that whether or not you 
can mmap it could affect its responsiveness.  The kernel config 
parameter is CONFIG_HPET_MMAP=y

-Yossi

On 06/04/2015 05:41 PM, Stanislav Sinyagin 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> 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> 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> 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>
>>>>> 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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>> http://www.freeswitchsolutions.com
>>
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> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
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>
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