Power-Mgt (Was: Re: cvs commit: src/sys/i386/cpufreq est.c )

[gnn at freebsd.org]

At Tue, 18 Mar 2008 18:26:11 +0000 (GMT),
rwatson wrote:
> 
> 
> I know we've talked about this, but I'll mention it for the benefits
> of the mailing list: one of the things that makes performance an
> "easy" target is that there are easy-to-gather metrics.  Those
> metrics may require knowledge of statistics and a lifetime of
> experience to interpret correctly, but they are still numbers that
> are easily generated and compared.  To drive work in power
> management, we would benefit from having similarly accessible
> metrics.  Are there any decent documents describing how to do power
> use measurement, and are there any (relatively) accessible tools for
> doing it with?  For example, on notebooks, can we sample an ACPI
> value before/after a benchmark, or do we really need to hook
> something up to the power supply in order to get a useful number?
> 

Queue did a series on this a while back, some decent articles and
ideas in there:

http://www.acmqueue.org/modules.php?name=Content&pa=list_pages_issues&issue_id=46

http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=513

Later,
George