[Freeswitch-users] Linux clocksource TSC vs HPET

[François]

Thanks for the info, i guess i'd better not change any of the defaults 
if it's working most of the times (except maybe HPET)! I thought things 
like that could help.

A couple of times a day during a minute or so, new channels hang between 
ROUTING to EXECUTE state (the rest works perfectly), and I can see this 
"RT Throttle" issue in dmesg. Strange thing is that the average load is 
pretty low (<10% cpu_usage, and <3 cpu_load on avg).

I'd better try to find and fix the cause of this than mess with kernel 
settings!

François.


On 2016-01-22 17:55, Anthony Minessale wrote:
> 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 at freeswitch.org 
> <mailto:consulting at freeswitch.org> for advanced support.
>
>
>
>
>
>
> On Fri, Jan 22, 2016 at 6:22 AM, François 
> <fdelawarde at wirelessmundi.com <mailto:fdelawarde at 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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