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Hi! > >>don't many of the multi-CPU problems with tsc go away because you've got a > >>per-cpu physical page for the vsyscall? > >> > >>i.e. per-cpu tsc epoch and scaling can be set on that page. > > > > Problem is that cpu's can randomly drift +/- 100 clocks or so... Not > > nice at all. > > > > ?100 clocks is what... ?50 ns these days? You can't get that kind of > accuracy for anything outside the CPU core anyway... 50ns is bad enough when it makes your time go backwards. Pavel -- Casualities in World Trade Center: ~3k dead inside the building, cryptography in U.S.A. and free speech in Czech Republic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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