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

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Message-ID: <Pine.LNX.4.64.0702121632420.19380@schroedinger.engr.sgi.com>
Date:	Mon, 12 Feb 2007 16:34:07 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	Vojtech Pavlik <vojtech@...e.cz>, Jiri Bohac <jbohac@...e.cz>,
	linux-kernel@...r.kernel.org, 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

On Fri, 2 Feb 2007, Andi Kleen wrote:

> I've threatened to just disable RDTSC for ring 3 before, but it'll likely
> never happen because too many programs use it.

Those programs are aware that they are fiddling around with low level 
material but with this patchset we are going to have a non 
monotonic time subsystem? Programs expects gettimeofday() etc to be 
monotonic. Its going to a big surprise if that is not working anymore.

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