Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross timestamps infrastructure

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On Fri, Jan 20, 2017 at 10:20:29AM -0200, Marcelo Tosatti wrote:
> Emulate PTP_SYS_OFFSET by using an arithmetic mean of the
> realtime samples from ->getcrosststamp callback.

This change log is not very informative.

Yes, I can see that the new code calculates a mean.

But WHY is this needed?

And why is this kvm case so special, that it requires its own new flag
within the generic PHC subsystem?

Thanks,
Richard
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