* [Xenomai-help] Clocksource tsc unstable
@ 2011-02-11 10:01 Henri Roosen
2011-02-11 21:34 ` Gilles Chanteperdrix
0 siblings, 1 reply; 2+ messages in thread
From: Henri Roosen @ 2011-02-11 10:01 UTC (permalink / raw)
To: xenomai
As soon as I start our Xenomai application we get a Linux kernel
message "Clocksource tsc unstable (delta = 305181188 ns)", after which
it switches to the pit clock.
Will this have impact on Xenomai threads running in relaxed mode?
Is this normal behavior? Is this because primary domain interrupted
the Linux clocksource watchdog for 305 ms? Should we disable the Linux
clocksource wathdog so it keeps using the tsc?
Xenomai: 2.5.5.2
Linux-kernel: 2.6.32.15
Platform: x86
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Xenomai-help] Clocksource tsc unstable
2011-02-11 10:01 [Xenomai-help] Clocksource tsc unstable Henri Roosen
@ 2011-02-11 21:34 ` Gilles Chanteperdrix
0 siblings, 0 replies; 2+ messages in thread
From: Gilles Chanteperdrix @ 2011-02-11 21:34 UTC (permalink / raw)
To: Henri Roosen; +Cc: xenomai
Henri Roosen wrote:
> As soon as I start our Xenomai application we get a Linux kernel
> message "Clocksource tsc unstable (delta = 305181188 ns)", after which
> it switches to the pit clock.
>
> Will this have impact on Xenomai threads running in relaxed mode?
>
> Is this normal behavior? Is this because primary domain interrupted
> the Linux clocksource watchdog for 305 ms? Should we disable the Linux
> clocksource wathdog so it keeps using the tsc?
Yes this is bad. But what you should do is that your application should
never interrupt linux for more than a clock tick, so, typically 10ms or
1ms, and it will not happen.
--
Gilles.
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2011-02-11 10:01 [Xenomai-help] Clocksource tsc unstable Henri Roosen
2011-02-11 21:34 ` Gilles Chanteperdrix
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