linux-kernel - Re: [PATCH] raise tsc clocksource rating

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Date:	Tue, 30 Oct 2007 10:13:59 -0200
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>, --cc@...hat.com,
	avi@...amnet.com, kvm-devel@...ts.sourceforge.net,
	John Stultz <johnstul@...ibm.com>
Subject: Re: [PATCH] raise tsc clocksource rating

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Ingo Molnar escreveu:
> * Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> and just in case it's not obvious: i am not arguing for the inclusion of 
> the patch, i'm just pointing out the plain fact that in the case where 
> the TSC _is_ reliable, 5 different clocksource drivers for has obvious 
> disadvantages. Anyone arguing against that simple point needs his head 
> examined :) Once we can pass around calibration information from the 
> host to the guest (which we dont do at the moment) there will be reason 
> not to use the native clocksource driver in the guest.
If you sustain that we cannot have a reliable synchronization test
mechanism, neither do I. All this is based in the assumption that a bad
tsc will fail such tests.

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