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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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