From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Antonio Del Cinque <adelcinque@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Interrupt latency questions
Date: Mon, 06 Oct 2008 16:48:47 +0200 [thread overview]
Message-ID: <48EA254F.1010702@domain.hid> (raw)
In-Reply-To: <1743f3b40810060744v7d55f706m62b46a1e27498524@domain.hid>
Antonio Del Cinque wrote:
> Is there any way to track these kind of latency in the ipipe, a kind of
> worst latency case tracker? I see only "virtual" IRQs 512 and 515 running in
> Xenomai domain. I cannot see where they are set up. I guess one of them is
> the system timer, and I know this is commonly driven by the powerpc
> decrementer. Is the GPIO interrupt latency due to the system timer
> interrupt? If this is the case, where can I disable the system timer in
> Xenomai, or modify the interrupt routine? I must run in interrupt context
> because of latency requirements (they asked me for deterministic latencies
> under 20 uS).
Yes, there is the I-pipe tracer:
http://www.xenomai.org/index.php/I-pipe:Tracer
Xenomai latency test has a -f option which triggers a trace for the
worst case.
--
Gilles.
next prev parent reply other threads:[~2008-10-06 14:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-22 9:15 [Xenomai-help] Interrupt latency questions Fillod Stephane
2008-09-23 8:22 ` Antonio Del Cinque
2008-09-23 8:25 ` Gilles Chanteperdrix
2008-10-06 14:44 ` Antonio Del Cinque
2008-10-06 14:48 ` Gilles Chanteperdrix [this message]
2008-10-07 12:02 ` Wolfgang Grandegger
-- strict thread matches above, loose matches on Subject: below --
2008-09-19 15:06 Antonio Del Cinque
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