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Date: Thu, 09 Jul 2009 21:20:49 +0300
From: Andriy Gapon <avg@freebsd.org>
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To: Thomas Backman <serenity@exscape.org>
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Cc: freebsd-current@freebsd.org
Subject: Re: dtrace users opinion solicited (timestamps)
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on 09/07/2009 21:00 Thomas Backman said the following:
> On Jul 9, 2009, at 19:31, Andriy Gapon wrote:
>> There are at least the following two alternatives:
>>
>> 1. Keep things as they are and warn users not to change CPU clock
>> frequency when
>> they use DTrace and the CPU doesn't have invariant TSC. I think that
>> this should
>> cause only minor inconveniences to a portion of DTrace users.
> Hmm, but "things as they are" causes an overflow about every 10 seconds,
> so the value is quite useless now (which, of course, you know about,
> having written a patch for it :)

This is because of a deficiency in the implementation of the formula, not because
of the formula itself.

> Is scenario #1 after the patch (PR kern/127441 for the rest of you) or not?

Yes, after the patch :)

-- 
Andriy Gapon