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Date:      Tue, 21 Sep 1999 20:22:32 -0700
From:      "David Schwartz" <davids@webmaster.com>
To:        "Brian F. Feldman" <green@FreeBSD.org>, "Luoqi Chen" <luoqi@watermarkgroup.com>
Cc:        <phk@FreeBSD.org>, <smp@FreeBSD.org>
Subject:   RE: Testers please!
Message-ID:  <000001bf04a9$b50ebf90$021d85d1@youwant.to>
In-Reply-To: <Pine.BSF.4.10.9909212306120.10399-100000@janus.syracuse.net>

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> One question comes to mind: is there a way that the TSCs could become
> desynchronized somehow?  Even though all CPUs run at the same frequency,
> isn't there a strong possibility for slight frequency deviation since
> we use crystal oscillation instead of a more accurate atomic breakdown
> for regulation, or am I just smoking crack?

	All CPUs should be clocked off of the same frequency multiplier off of the
same crystal, so it _should_ be impossible for the TSCs to drift apart due
to that. I guess it might be theoretically possible that something might
cause the TSCs to drift. Perhaps something crazy with APM and/or SMM. It
should be tested.

	It should also be tested that they begin at the same place. Perhaps
processors might take different amount of times to 'come out of' reset.

	I wouldn't assume anything.

	DS



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