* [Xenomai-help] xeno-test output
@ 2009-03-16 16:04 Salvatore De Astis
2009-03-16 16:10 ` Gilles Chanteperdrix
0 siblings, 1 reply; 2+ messages in thread
From: Salvatore De Astis @ 2009-03-16 16:04 UTC (permalink / raw)
To: xenomai
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Hi at all!
I tested the xenomai performance with xeno-test but the "in-kernel
periodic task" test mode shows me negative latencies, why?
I've attached the report.
Do you take a look at file and tell me if there is something wrong in
my configuration, please?
Regards!
--
Salvatore De Astis
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Xenomai-help] xeno-test output
2009-03-16 16:04 [Xenomai-help] xeno-test output Salvatore De Astis
@ 2009-03-16 16:10 ` Gilles Chanteperdrix
0 siblings, 0 replies; 2+ messages in thread
From: Gilles Chanteperdrix @ 2009-03-16 16:10 UTC (permalink / raw)
To: Salvatore De Astis; +Cc: xenomai
Salvatore De Astis wrote:
> Hi at all!
> I tested the xenomai performance with xeno-test but the "in-kernel
> periodic task" test mode shows me negative latencies, why?
> I've attached the report.
> Do you take a look at file and tell me if there is something wrong in
> my configuration, please?
That is because Xenomai timer anticipates, usually to get an almost null
latency for user-space tasks. So, you get negative latencies in
kernel-space. Fortunately, you can choose this (fixed) anticipation with
/proc/xenomai/latency.
--
Gilles.
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2009-03-16 16:04 [Xenomai-help] xeno-test output Salvatore De Astis
2009-03-16 16:10 ` Gilles Chanteperdrix
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