* Rik van Riel <riel@xxxxxxxxxx> wrote: > John Stultz wrote: >> On Tue, 2009-06-02 at 01:22 +0200, Ingo Molnar wrote: > >>> I might be missing something here - but Linux converging faster >>> seems like a genuinely good thing. What non-Linux problem could >>> there be? Linux's convergence is really Linux's private issue. >> >> Yea. It does seem that way. Miroslav can likely expand on the >> issue to help clarify, but as I understand it, the example is if >> you have a number of systems that are peers in an NTP network. >> All of them are using the same userland NTP daemon. However, if >> the rate of change that corrections are applied is different in >> half of them, you will have problems getting all the systems to >> converge together. > > Would this not be true already, because the convergence of Linux > system suddenly became a lot slower in 2.6.19? > > Damned if we do, damned if we don't - except the new behaviour > introduced by your patches is nicer. Not just that - but there's calibration noise during bootup that can cause randomly distributed recalibrations as well. So other hosts in a mixed environment will see inconsistencies anyway, after every bootup. NTP is all about being able to be resilient against time noise and being able to sync up to a common time base ASAP. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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