On 05/04/14 10:05, Allan Jude wrote:
On 2014-05-04 11:47, Allan Jude wrote:
On 2014-05-04 10:28, Matthias Apitz wrote:
El día Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberman escribió:
On Sat, May 3, 2014 at 1:25 PM, Adrian Chadd <adr...@freebsd.org> wrote:
Set it to the lowest available Cx state that you see in dev.cpu.0 .
Available is not required. Set it to C8. That guarantees that you will use
the lowest available. The correct incantation in rc.conf is "Cmax".
performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"
But, unless you want laggy performance, you will probably also want:
hint.p4tcc.0.disabled=1
hint.acpi_throttle.0.disabled=1
in /boot/loader.conf. Low Cx states and TCC/throttling simply don't mix
well and TCC is not effective, as mentioned earlier in this thread.
Re/ powerd I have in /etc/rc.conf:
# powerd
powerd_enable="YES"
powerd_flags="-a max -b adp"
#
performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"
(and the additional hint.* in /boot/loader.conf as well). Which process
'performance_cx_lowest' and 'economy_cx_lowest' target exactly as config
values?
Thx
matthias
In a pretty unscientific test on my laptop (Lenovo T530 with Intel i5
3320M), setting hw.acpi.cpu.cx_lowest=C8 lowered power consumption at
idle by about 3 watts, which adds about 30-45 minutes to my battery life
during conservative usage.
Using PCBSD 10, so hint.acpi_throttle.0.disabled=1 was already set
(apparently solves some issue with powerd on some AMD systems)
I have added hint.p4tcc.0.disabled=1 but not sure where to expect to see
a difference.
I see the difference now, with the p4tcc stuff disabled, the lowest
cpufreq is now 1200mhz instead of 150mhz
I just set the default for acpi_throttle and p4tcc in HEAD to disabled
by adding these line to the default /boot/device.hints. If you want them
back, editing your device.hints will restore them. This can be reverted
if many people want throttling enabled by default, but all I have heard
so far -- and for the past many years -- is a unanimous chorus to turn
it off.
-Nathan
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