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From: Thomas Gleixner <tglx@linutronix.de>
To: Philipp Kohlbecher <xt28@gmx.de>
Cc: linux-kernel@vger.kernel.org, John Stultz <johnstul@us.ibm.com>
Subject: Re: clocksources: order of preference
Date: Thu, 8 May 2008 13:46:38 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LFD.1.10.0805081345340.3318@apollo.tec.linutronix.de> (raw)
In-Reply-To: <4822DF0B.8080109@gmx.de>

On Thu, 8 May 2008, Philipp Kohlbecher wrote:
> Thomas Gleixner wrote:
> > We also check the TSC with a watchdog mechanism, which verifies that
> > is is keeping accurate time. When we detect that TSC does not, we
> > replace it by the next available clock source.
> >   
> True. In all the cases I know, the watchdog mechanism worked and marked the
> TSC as unstable. The soft lockup only led to a (sometimes considerable) delay
> at boot time.

Yeah, there are some hard to detect cases. This TSC business is a
major PITA.

Thanks,
	tglx

      reply	other threads:[~2008-05-08 11:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-08 10:40 Philipp Kohlbecher
2008-05-08 10:59 ` Thomas Gleixner
2008-05-08 11:07   ` Philipp Kohlbecher
2008-05-08 11:46     ` Thomas Gleixner [this message]

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