Alex Williamson wrote:
On Fri, 2005-08-26 at 08:39 -0700, Christoph Lameter wrote:
I think a priority is something useful for the interpolators. Some of
the decisions about which time sources to use also have criteria different
from drift/latency/jitter/cpu. F.e. timers may not survive various
power-saving configurations. Thus I would think that we need a priority
plus some flags.
Some of the criteria for choosing a time source may be:
Hi Christoph,
I sent another followup to this thread with a patch containing a
fairly crude algorithm that I think better explains my starting point.
I'm sure the weighting and scaling factors need work, but I think many
of the criteria you describe will favor the right clock.
1. If a system boots up with a single cpu then there is no question that
the ITC/TSC should be used because of the fast access.
We need to factor in frequency shifting here, especially if it happens
with out notice.
~
--
George Anzinger [email protected]
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
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