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

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Message-ID: <47271CAE.8000907@redhat.com>
Date:	Tue, 30 Oct 2007 09:59:42 -0200
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	Zachary Amsden <zach@...are.com>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, rusty@...tcorp.com.au, jeremy@...p.org,
	--cc@...hat.com, avi@...amnet.com, kvm-devel@...ts.sourceforge.net,
	Glauber de Oliveira Costa <glauber@....localdomain>,
	Dan Hecht <dhecht@...are.com>,
	Garrett Smith <garrett@...are.com>
Subject: Re: [PATCH] raise tsc clocksource rating

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Zachary Amsden escreveu:
> On Mon, 2007-10-29 at 23:48 +0100, Ingo Molnar wrote:
>> * Zachary Amsden <zach@...are.com> wrote:
> 
>> if it's inaccurate why are you exposing it to the guest then? Native 
>> only uses the TSC if it's safe and accurate to do so.
> 
> Not every guest support paravirt, but for correctness, all guests
> require TSC, which must be exposed all the way up to userspace, no
> matter what the efficiency or accuracy may be.
> 
> Zach
> 
However, with such accuracy, it will fail the tsc clocksources tests. If
it passes, it'a good clocksource to use.
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