Messages in this thread | | | Date | Wed, 27 Sep 2017 20:05:48 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early in boot |
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On Wed, Sep 27, 2017 at 09:52:36PM +0800, Dou Liyang wrote: > We do not want to do that. Because, we use "notsc" to support Dynamic > Reconfiguration[1]. > > AFAIK, this feature enables hot-add system board which contains CPUs > and memories. But the CPUs in different board may have different TSCs > which are not consistent with the TSC from the existing CPUs. If we hot-add > a board directly, the machine may happen the inconsistency of > TSC. > > We make our effort to specify the same TSC value as existing one through > hardware and firmware, but it is hard. So we recommend to specify > "notsc" option in command line for users who want to use Dynamic > Reconfiguration.
Oh gawd, that's horrific. And in my book a good reason to kill that option.
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