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From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Steven Seeger <steven.seeger@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] rtdm timer questions
Date: Thu, 12 Mar 2009 12:12:10 +0100	[thread overview]
Message-ID: <49B8EE0A.3050708@domain.hid> (raw)
In-Reply-To: <E8013A51-96DB-4DF4-A083-C5BA81A3697B@comcast.net>

Steven Seeger wrote:
> Is an RTDM timer going to run at a priority higher than any scheduled  
> realtime thread?
> 
> How accurate is the timing?
> 
> We are seeing the timer running at 125us periodic rate being called  
> much too quickly. At least, I think we are. I can't personally use  
> anything for a little over a week.

Yes a timer runs in interrupt context. This is the same design as Linux,
VxWorks, RTLinux, RTAI and most known OSes.

I do not understand what you mean by "too quickly", but do you get the
same phenomenon with the klatency -t 2 test?

-- 
                                                 Gilles.


  reply	other threads:[~2009-03-12 11:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-12 10:55 [Xenomai-core] rtdm timer questions Steven Seeger
2009-03-12 11:12 ` Gilles Chanteperdrix [this message]
2009-03-12 11:29   ` Steven Seeger
2009-03-12 11:46     ` Jan Kiszka
2009-03-12 11:50       ` Steven Seeger
2009-03-12 11:51       ` Steven Seeger
2009-03-12 12:09         ` Jan Kiszka
2009-03-12 12:15           ` Steven Seeger

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