linux-kernel - Re: [KVM timekeeping 10/35] Fix deep C-state TSC desynchronization

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Message-ID: <20100820173038.GE2937@mothafucka.localdomain>
Date:	Fri, 20 Aug 2010 14:30:38 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
Cc:	kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [KVM timekeeping 10/35] Fix deep C-state TSC desynchronization

On Thu, Aug 19, 2010 at 10:07:24PM -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.
> 
> Signed-off-by: Zachary Amsden <zamsden@...hat.com>
Fair enough.

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