From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <496DEDBB.8000204@domain.hid> Date: Wed, 14 Jan 2009 14:50:51 +0100 From: Jan Kiszka MIME-Version: 1.0 References: <496DEB16.5060803@domain.hid> In-Reply-To: <496DEB16.5060803@domain.hid> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] Clock drift. List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gilles Chanteperdrix Cc: Xenomai core Gilles Chanteperdrix wrote: > Hi, > > I run clocktest on a system here, not running NTP, using > CONFIG_GENERIC_CLOCKEVENT, with a systematic drift of 3us/s. How can > this happen? Does it come from the error due to the multiply and shift > used for tsc to/from ns conversions ? What clocksource is used by Linux? Also tsc? Jan -- Siemens AG, Corporate Technology, CT SE 26 Corporate Competence Center Embedded Linux