At 05:45 PM 4/10/2008, Poul-Henning Kamp wrote: >In message <47FE7E0C.4070801_at_FreeBSD.org>, Maxim Sobolev writes: > >Kris Kennaway wrote: > >> gnn_at_freebsd.org wrote: > >>> Howdy, > >>> > >>> Is the TSC timecounter synchronized across multiple cores and/or > >>> processors? A quick search seems to indicate it's not but I'd like to > >>> find a definitive reference on the TSC. > >> > >> Modern Intel systems tend to be synchronized, in my experience. > > > >I really doubt they are. As far as I know newest milti-core chips can > >modulate frequency of even suspend individual cores independently of > >each other, which would make such synchronization difficult to maintain > >if the power management is on. > >P4 (and I think most newer chips) have a TSC that runs independent >of the cpu clock frequency, and supposedly, always at constant rate. > Are you talking about the RDTSCP? I think its only on newer opterons and phenoms.Received on Thu Apr 10 2008 - 20:38:49 UTC
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