linux-kernel - Re: [patch 4/9] Remove the TSC synchronization on SMP machines

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Date:	Thu, 01 Feb 2007 13:05:44 -0800
From:	mbligh <mbligh@...igh.org>
To:	Andi Kleen <ak@...e.de>
Cc:	jbohac@...e.cz, linux-kernel@...r.kernel.org,
	Vojtech Pavlik <vojtech@...e.cz>, ssouhlal@...ebsd.org,
	arjan@...radead.org, tglx@...utronix.de, johnstul@...ibm.com,
	zippel@...ux-m68k.org, andrea@...e.de
Subject: Re: [patch 4/9] Remove the TSC synchronization on SMP machines

Andi Kleen wrote:
> On Thursday 01 February 2007 10:59, jbohac@...e.cz wrote:
>> TSC is either synchronized by design or not reliable
>> to be used for anything, let alone timekeeping.
> 
> In my tree this is already done better by a patch from Ingo.
> Check if they look synchronized and don't use TSC if they are not.

Is it going to notice dynamically when one cpu ramps down/up
during runtime, and looses sync?

M.

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