linux-kernel - Re: [PATCH 04/17] Fix deep C-state TSC desynchronization

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Message-ID: <20100616132436.GJ19104@mothafucka.localdomain>
Date:	Wed, 16 Jun 2010 10:24:37 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
Cc:	avi@...hat.com, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/17] Fix deep C-state TSC desynchronization

On Mon, Jun 14, 2010 at 09:34:06PM -1000, Zachary Amsden wrote:
> When CPUs with unstable TSCs enter deep C-state, TSC may stop
> running.  This causes us to require resynchronization.  Since
> we can't tell when this may potentially happen, we assume the
> worst by forcing re-compensation for it at every point the VCPU
> task is descheduled.
can't we just compensate everytime check_tsc_unstable() is true?


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