From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <49B8EE0A.3050708@domain.hid> Date: Thu, 12 Mar 2009 12:12:10 +0100 From: Gilles Chanteperdrix MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] rtdm timer questions List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Steven Seeger Cc: xenomai@xenomai.org 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.