> From: Rafael Vanoni [mailto:[email protected]] > Sent: Thursday, November 14, 2013 10:33 AM > > # echo "cpupm::print" | mdb -k
2 (PM_CPUPM_EVENT) Cool, looks like I'm good, thanks :). > I think the default option refers to when you don't specify > cpu_deep_idle at all, which is equivalent to having it and 'enable'. > If you enable and the hardware doesn't support it, the OS falls back > to whatever it can. No, that's not what the man page reads as (excerpted below), at least to my eyes. In checking the source code, looks like "disable", "enable", and "default" are all valid to explicitly specify (https://github.com/illumos/illumos-gate/blob/7256a34efe9df75b638b9e812912ef 7c5c68e208/usr/src/cmd/power/handlers.c), and "default" is exactly the same as "enable" -- "Default policy is same as enable" (https://github.com/illumos/illumos-gate/blob/7256a34efe9df75b638b9e812912ef 7c5c68e208/usr/src/uts/i86pc/os/cpupm/cpu_idle.c). So if you don't mention it at all, it is the same as "default" which is the same as "enable". Seems it would be simpler to only have one option, disable, but at least now I understand what it's doing. Thanks much. --------- If supported by the platform, a cpu_deep_idle entry can be used to enable or disable automatic use of power saving cpu idle states. The format of the cpu_deep_idle entry is: cpu_deep_idle behavior Acceptable values for behavior are: default Advanced cpu idle power saving features are enabled on hardware which supports it. On X86 systems this can translate to the use of ACPI C- States beyond C1. enable Enables the system to automatically use idle cpu power saving features. disable The system does not automatically use idle cpu power saving features. This option can be used when maximum performance is required at the expense of power. Illumos Last change: Feb 27, 2009 7 File Formats POWER.CONF(4) absent It the cpu_deep_idle keyword is absent from power.conf the behavior is the same as the default case. ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
