Brown, Len wrote:
Digging up this patch from last month regarding C2
on a AMD K7 implies
that the whole blame can be put on kernel acpi:
http://marc.theaimsgroup.com/?l=linux-kernel&m=111933745131301&w=2
The current Linus tree includes generic ACPI support
for deep C-states on SMP machines. (deep means higher than C1)
I don't have any problem with people having platform specific
modules to handle platform specific features. However, if
the system really intends to support SMP ACPI C-states deeper
than C1 and the generic ACPI code doesn't support it,
then it is either a Linux/ACPI bug or a BIOS bug -- file away:-)
I.e. The whole concept of ACPI is that you shoulud _not_ need
a platform specific driver to accomplish this.
Is anyone but me interested in low power states for servers? I have
several groups of servers which are lightly utilized for at least 12
hours every day and on weekends. I currently use IDE drives so I can
spin them down when idle, do logging either to a single drive or over
the network whichever makes the most sense, and any drop in power use
saves double, since I pay for the server power and the A/C power as well.
I haven't seen much discussion of this, but in many cases it would
result in a saving, perhaps fairly large. Some environmental benefit as
well, of course.
--
-bill davidsen ([email protected])
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me
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