From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: jagarcia@domain.hid, xenomai@xenomai.org
Subject: Re: [Xenomai-core] [Xenomai-help] AT91SAM9260 latency
Date: Mon, 11 Feb 2008 22:30:16 +0100 [thread overview]
Message-ID: <18352.48744.598358.653963@domain.hid> (raw)
In-Reply-To: <47B081C8.60409@domain.hid>
Jan Kiszka wrote:
> There is a shadow relax procedure running before the timer IRQ fires,
> and that takes another context switch. So the latency sum is:
>
> - unrelated context switch
> - timer IRQ
> - switch to woken up RT process
> - serial IRQ
>
> Almost the theoretical worst case.
The problem is that it does not happen when launching latency with -t 1
or -t 2, or if latency is not run in the background.
Anyway, I will investigate on the double ack issue, because it could
mean that there is a double EOI, which, I guess could cause some
troubles at interrupt controller level.
--
Gilles Chanteperdrix.
next prev parent reply other threads:[~2008-02-11 21:30 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-23 6:52 [Xenomai-help] AT91SAM9260 latency Juan Antonio Garcia Redondo
2008-01-23 10:04 ` Gilles Chanteperdrix
2008-01-23 13:15 ` Gilles Chanteperdrix
2008-01-24 9:41 ` Juan Antonio Garcia Redondo
2008-01-24 10:02 ` Gilles Chanteperdrix
2008-01-25 10:04 ` Juan Antonio Garcia Redondo
2008-01-25 17:00 ` Gilles Chanteperdrix
2008-01-28 8:51 ` Juan Antonio Garcia Redondo
2008-01-28 9:21 ` Juan Antonio Garcia Redondo
2008-01-28 13:19 ` Gilles Chanteperdrix
2008-01-28 13:34 ` Jan Kiszka
2008-01-28 13:35 ` Gilles Chanteperdrix
2008-01-28 13:46 ` Jan Kiszka
2008-01-28 13:51 ` Gilles Chanteperdrix
2008-01-28 14:10 ` Jan Kiszka
2008-01-29 8:09 ` Juan Antonio Garcia Redondo
2008-01-29 8:35 ` Gilles Chanteperdrix
2008-01-29 17:19 ` Gilles Chanteperdrix
2008-01-30 9:03 ` Juan Antonio Garcia Redondo
2008-02-10 20:31 ` [Xenomai-core] " Gilles Chanteperdrix
2008-02-11 13:41 ` Jan Kiszka
2008-02-11 14:05 ` Gilles Chanteperdrix
2008-02-11 17:11 ` Jan Kiszka
2008-02-11 21:30 ` Gilles Chanteperdrix [this message]
2008-02-11 22:36 ` Gilles Chanteperdrix
2008-02-12 7:04 ` Gilles Chanteperdrix
2008-02-12 7:53 ` Gilles Chanteperdrix
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