Date: Fri, 23 Aug 2002 14:13:14 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: current@FreeBSD.ORG Subject: Re: how to compute the skew between TSC in SMP systems ? Message-ID: <20020823141314.A82172@iguana.icir.org> In-Reply-To: <29486.1030136549@critter.freebsd.dk>; from phk@critter.freebsd.dk on Fri, Aug 23, 2002 at 11:02:29PM %2B0200 References: <20020823134410.A81962@iguana.icir.org> <29486.1030136549@critter.freebsd.dk>
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On Fri, Aug 23, 2002 at 11:02:29PM +0200, Poul-Henning Kamp wrote: > In message <20020823134410.A81962@iguana.icir.org>, Luigi Rizzo writes: > >Hi, > >does anyone have an idea on how to determine the skew between > >TSC content in the various processors on an SMP box ? > > On i386: It cannot be reliably done. Been there, tried that. the problem being what, too much jitter e.g. in measurement method that i suggested or something similar ? Do you know what kind of error you can get away with ? cheers luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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