linux-kernel - Re: [PATCH 0/3] Improve TSC as a clocksource under VMware

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Message-Id: <1224625316.6161.105.camel@alok-dev1>
Date:	Tue, 21 Oct 2008 14:41:56 -0700
From:	Alok Kataria <akataria@...are.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Daniel Hecht <dhecht@...are.com>
Subject: Re: [PATCH 0/3] Improve TSC as a clocksource under VMware

On Tue, 2008-10-21 at 12:47 -0700, Alok Kataria wrote:
> On Tue, 2008-10-21 at 12:27 -0700, Andi Kleen wrote:
> > On Tue, Oct 21, 2008 at 12:10:36PM -0700, Alok Kataria wrote:
> > > On Tue, 2008-10-21 at 11:15 -0700, Andi Kleen wrote:

> > When the margin changes then it likely won't be good enough for
> > gettimeofday(). There are a couple of testers for monotonity around,
> > would such a system with shifting marging surive running them
> > for a few days?
> 
> I meant, the margin changes when you are running different flavors of
> the build, or running different user configurations (from overcommitment
> POV). Once a system is booted the margin won't vary, apart from the
> bootup stage which will always have some extreme states. In all our
> internal testing that has been done, 

> we have never noticed time drift is
> withing the NTP threshold when its compared to the host system, under
> varying load. 
> 

oops... i meant the time drift is _always_ within the NTP threshold.


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