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

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Message-Id: <1193698505.9793.90.camel@bodhitayantram.eng.vmware.com>
Date:	Mon, 29 Oct 2007 15:55:05 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	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

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

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