From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Henri Roosen <henriroosen@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Clocksource tsc unstable
Date: Fri, 11 Feb 2011 22:34:36 +0100 [thread overview]
Message-ID: <4D55AB6C.6090406@domain.hid> (raw)
In-Reply-To: <AANLkTikj+m-orgz_HgQ=-u4PLtS+eAXuMxLWbV6ZmR5m@domain.hid>
Henri Roosen wrote:
> As soon as I start our Xenomai application we get a Linux kernel
> message "Clocksource tsc unstable (delta = 305181188 ns)", after which
> it switches to the pit clock.
>
> Will this have impact on Xenomai threads running in relaxed mode?
>
> Is this normal behavior? Is this because primary domain interrupted
> the Linux clocksource watchdog for 305 ms? Should we disable the Linux
> clocksource wathdog so it keeps using the tsc?
Yes this is bad. But what you should do is that your application should
never interrupt linux for more than a clock tick, so, typically 10ms or
1ms, and it will not happen.
--
Gilles.
prev parent reply other threads:[~2011-02-11 21:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-11 10:01 [Xenomai-help] Clocksource tsc unstable Henri Roosen
2011-02-11 21:34 ` Gilles Chanteperdrix [this message]
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