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Date:	Mon, 7 Apr 2008 08:27:55 +0200 (CEST)
From:	Thomas Gleixner <>
To:	Roman Zippel <>
cc:	john stultz <>,
	Paul Mackerras <>,
	Tony Luck <>, Ingo Molnar <>,
	lkml <>
Subject: Re: [PATCH] Close small window for vsyscall time inconsistencies

On Mon, 7 Apr 2008, Roman Zippel wrote:
> Hi,
> On Friday 4. April 2008, john stultz wrote:
> > So Thomas and Ingo pointed out to me that they were occasionally seeing
> > small 1ns inconsistencies from clock_gettime() (and more rarely, 1us
> > inconsistencies from gettimeofday() when the 1ns inconsistency occurred
> > on a us boundary)
> What does inconsistency mean?

Time is going backwards by 1us/1nsec.
> So instead of shooting in the dark, I'd suggest to collect some
>  numbers first,

That's what we did and John's analysis of the problem is pretty

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