xen 3 clock (was Re: Panic with NetBSD 3.0 XENU)

[Jed Davis <jdev%panix.com@localhost>]

"Felipe Alfaro Solana" <felipe.alfaro%gmail.com@localhost> writes:

> get_tsc_offset_ns: tsc_delta=183617979 offset=612180549
> get_tsc_offset_ns: tsc_delta=188671715 offset=629029656
> get_tsc_offset_ns: tsc_delta=189550229 offset=631958613
> get_tsc_offset_ns: tsc_delta=194527317 offset=648552176
> get_tsc_offset_ns: tsc_delta=195652938 offset=652304985
> get_tsc_offset_ns: tsc_delta=200779803 offset=669397903

As an aside: isn't this normal in Xen 3, since the shared time page is
updated only once a second or so, instead of every tick?  If that's
the case, I'll (or someone else can) update the DEBUG-conditioned
sanity check in get_tsc_offset_ns that triggers that printf.

We might also want to save a copy of the serial number of the time
info, to skip unnecessarily copying it and recomputing stuff if it
hasn't been updated.

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