From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Salvatore De Astis <dev.rinux@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] xeno-test output
Date: Mon, 16 Mar 2009 17:10:08 +0100 [thread overview]
Message-ID: <49BE79E0.8030401@domain.hid> (raw)
In-Reply-To: <5eecf1c50903160904oc5b34bcwb49ea3b7dbbbfe28@domain.hid>
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.
prev parent reply other threads:[~2009-03-16 16:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-16 16:04 [Xenomai-help] xeno-test output Salvatore De Astis
2009-03-16 16:10 ` Gilles Chanteperdrix [this message]
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