Seth Hieronymus wrote:
> Do processors use more power / produce more heat when they are doing
> processing other than an idle loop?
> Just wondering.
Depends on what happens in the idle loop.
If the idle loop is a HLT or an ACPI reduction in the power
settings on one or more devices, then yes, there is some
reduction in the power used. The ACPI stuff is normally
use when the machine is genuinely idle, rather than merely
executing in the idle loop.
Generally, the idle loops means that you have outstanding
requests to hardware standing unstatisfied, and are waiting
for an interrupt before you can do more work.
Not all idle loops HLT the processor. The SMP stuff started
out not HLTing the processor, do to SMP schedule lock holding
In genreal, the amount is going to be negligible, compared to
the energy required to keep the hard drives or fans spinning.
I always love to see the "Energy Star" logo come up on boot on
my machines. It means that it took three times as much energy
to manufacture them as they would have additioanlly used during
their entire operational life, had they not been "Energy Star"
-ified. I guess some people just like to pay extra for their
electricity so that they can pay for it up front.
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-chat" in the body of the message