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

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Message-Id: <1171348808.12771.19.camel@laptopd505.fenrus.org>
Date:	Tue, 13 Feb 2007 07:40:08 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <ak@...e.de>, Vojtech Pavlik <vojtech@...e.cz>,
	Jiri Bohac <jbohac@...e.cz>, linux-kernel@...r.kernel.org,
	ssouhlal@...ebsd.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 Mon, 2007-02-12 at 16:34 -0800, Christoph Lameter wrote:
> 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?

no quite the opposite. gettimeofday() currently is NOT monotonic
unfortunately. With this patchseries it actually has a better chance of
becoming that...

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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