linux-kernel - Re: [PATCH 6/6] don't compute pvclock adjustments if we trust the tsc

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Message-ID: <20100427185753.GR16166@mothafucka.localdomain>
Date:	Tue, 27 Apr 2010 15:57:53 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] don't compute pvclock adjustments if we trust the tsc

On Tue, Apr 27, 2010 at 09:03:55PM +0300, Avi Kivity wrote:
> On 04/27/2010 04:40 PM, Marcelo Tosatti wrote:
> >On Mon, Apr 26, 2010 at 01:46:28PM -0400, Glauber Costa wrote:
> >>If the HV told us we can fully trust the TSC, skip any
> >>correction
> >>
> >Please drop this. Its not certain what is the best method to reduce
> >contention on the global variable. Whatever it is, can be done later.
> >
> 
> The problem is lead time.  If we (or the cpu vendors) fix this in
> the hypervisor/processors in a year, then we want existing guests to
> take advantage of it immediately.
100 % Agreed.
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