STI, HLT in acpi_cpu_idle_c1

[Andrew Thompson]

On Tue, Jun 22, 2004 at 02:34:26PM -0700, Matthew Dillon wrote:
> 
> :
> :On Thursday 17 June 2004 07:33 pm, Matthew Dillon wrote:
> :>     It kinda sounds like ACPI has bokered the other cpus.  I'm not sure
> :>     why one would even *want* to use ACPI to idle down Xeon's in an MP
> :>     system, actually :-)
> :
> :Power and heat savings.
> :
> :-- 
> :John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> 
>     All well and nice, but if you want power and heat savings you don't 
>     purchase a big honking SMP box in the first place.
> 

Sure, but what about the larger scale. 

Put 100 or a 1000 of them in a room and any heat savings make a big difference
to your air-conditioning and power distribution.