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SubjectRe: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross timestamps infrastructure
On Mon, Jan 23, 2017 at 11:19:17AM -0200, Marcelo Tosatti wrote:
> This is needed to generate the PTP_SYS_OFFSET data: a table with read
> from realtime clock, read from device clock, read from realtime clock,
> ... :
>
> time ->
> device clock | |sample2| |sample4| |sample6| ...
> -------------------------------------------------------------
> realtime clock |sample1| |sample3| |sample5|

Here "realtime clock" is CLOCK_REALTIME on the guest, and "device
clock" is CLOCK_REALTIME on the host?

> Where sampleN is the read of the respective clock.
>
> From the following PTP_SYS_OFFSET_PRECISE data:
>
> device clock |sample1P,deviceclock| |sample2P,deviceclock|
> -------------------------------------------------------------
> realtime clock |sample1P,realtimeclock| |sample2P,realtimeclock|

Are |sample1P,deviceclock| and |sample1P,realtimeclock| taken at the
same instant in time?

If not, then calling that PTP_SYS_OFFSET_PRECISE is misleading.

Still don't get what you are doing here...

Thanks,
Richard

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