[lkml]   [2001]   [Jun]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: temperature standard - global config option?

On Fri, 8 Jun 2001, Albert D. Cahalan wrote:

> Michael H. Warfiel writes:
> > We don't have sensors that are accurate to 1/10 of a K and certainly not
> > to 1/100 of a K. Knowing the CPU temperature "precise" to .01 K when
> > the accuracy of the best sensor we are likely to see is no better than
> > +- 1 K is just about as relevant as negative absolute temperatures.
> ...
> > Even if we had or could, anticiplate, sensors with a +- .01 K,
> > the relevance of knowing the CPU temperature to that precision is
> > lost on me. I see no sense in stuffing a field with meaningless
> > bits just because the field will hold them. In fact, this "false precision"
> > quickly leads to the false impression of accuracy. Based on several
> > messages I have seen on this thread and in private E-Mail, there are a
> > number of people who don't seem to grasp the fundamental difference
> > between precision and accuracy and truely don't understand that adding
> > meaningless precision like this adds nothing to the accuracy.
> >
> > I can see maybe making it precise to .1 K. But stuffing the bits
> > in there to be precise to .01 K just because we have the bits and not
> > because we have any realistic information to fill the bits in with, is
> > just silly to me. Just as silly as allowing for negative numbers in an
> > absolute temperature field. We have the bits to support it, but why?
> The bits are free; the API is hard to change.
> Sensors might get better, at least on high-end systems.
> Rounding gives a constant 0.15 degree error.
> Only the truly stupid would assume accuracy from decimal places.
> Again, the bits are free; the API is hard to change.
> One might provide other numbers to specify accuracy and precision.

I really do not belive that for a CPU or a motherboard +- 1 degree would
make any difference.

If a CPU runs fine at, say, 37 degrees C, I do not belive it will have any
problems running at 38 or 36 degrees. I support the ideea of having very
good sensors for temperature monitoring, but CPU and motherboard
temperature do not depend on the rise of the temperature of 1 degree, but
when the temperature rises 10 or more degrees. I hope you understand what
I want to say.



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:55    [W:0.147 / U:1.448 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site