Hi Darrick, hi Henrique,
Good thing that manufacturers start including wattmeters in their
hardware. Hopefully this will help users better control their power
consumption in the long run.
On Mon, 27 Aug 2007 22:50:29 -0300, Henrique de Moraes Holschuh wrote:
> On Mon, 27 Aug 2007, Darrick J. Wong wrote:
> > documentation doesn't mention any naming conventions for sensors that
> > measure Watts, so I am proposing that they be called "powerX_input" in a
> > fashion similar to temperature/rpm/current sensors. If that is
> > agreeable to everyone, I'll post a follow-up patch to amend the
> > documentation.
>
> What unit should we use? Watts are way, way too big as there is no
> floating/fixed point in sysfs. 10^-6 W is probably what is called for,
> since we already need 10^-3 V and 10^-3 A. Small portable devices can
> easily draw less than 10^-3 W nowadays.
Good point. The driver currently exports non-integer values, which is
not acceptable, so indeed it needs to be changed. We want at least a
resolution of 10^-3 W. Not sure about 10^-6 W. I am surprised that
portable devices can really draw less than 1 mW, and be it the case, I
doubt that manufacturers will embed a wattmetter: it would probably
draw more current than the rest of the device ;) so it may not be
relevant for our decision.
So I think I'd go with 10^-3 W, but I welcome diverging opinions. Out
of curiosity, what is the physical resolution of IBM's device?
I see that the driver relies on IPMI. Can't it be merged with the
out-of-tree impisensors driver then? This would give that driver some
momentum so that it can finally be merged, and I would like to avoid
having two drivers if one is enough. Note though that I don't know
anything about IPMI so I might as well be totally wrong ;)
--
Jean Delvare
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