These things mainly come up when someone is trying to overload a system or drag more out of it.
If its already working, there is no need to mess with the clock source.
HPET is for sure more accurate and can come in handy when doing heavy load because, yes, it uses the cpu but it does so from the kernel which has priority,  You want timing to always have priority.
If you are triggering real time throttling issues, you are probably pushing the box pretty hard.  This is considered very advanced tuning and we don't really endorse it for community level support.

Consider contacting consulting@freeswitch.org for advanced support.






On Fri, Jan 22, 2016 at 6:22 AM, François <fdelawarde@wirelessmundi.com> wrote:
Hi all,

I'm trying to find a solution for an "RT throttling" issue under
relatively high load (20cps) on linux 3.10 and CPU Xeon E5-1650v2
(6cores). A similar jira ticket FS-8620 has a recommendation to set the
clocksource to "hpet":

echo hpet > /sys/devices/system/clocksource/clocksource0/current_clocksource

I read somewhere that the default clocksource (TSC) is lighter in CPU
usage because it only requires reading a register that is synchronized
across all cores...

Considering FreeSWITCH needs:

-> Is HPET recommended over the default "TSC" clock?

-> Does a change in clocksource have immediate effects or does it
require an FS restart/reboot?

-> Also, is it recommended to disable RT-throttling to resolve these
types of issues?

echo -1 >/proc/sys/kernel/sched_rt_runtime_us
echo -1 >/proc/sys/kernel/sched_rt_period_us

Thanks,
François.

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