Date: Sat, 29 May 2010 12:28:25 +0200 (CEST) From: Tobias Rehbein <tobias.rehbein@web.de> To: FreeBSD-gnats-submit@FreeBSD.org Cc: mav@FreeBSD.org Subject: docs/147180: Fix manpage of acpi(4): No need to disable the whole APIC subsystem for CPU idle states C3 and deeper Message-ID: <201005291028.o4TASPmw006911@sushi.pseudo.local> Resent-Message-ID: <201005291030.o4TAU93H039943@freefall.freebsd.org>
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>Number: 147180
>Category: docs
>Synopsis: Fix manpage of acpi(4): No need to disable the whole APIC subsystem for CPU idle states C3 and deeper
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Sat May 29 10:30:08 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Tobias Rehbein
>Release: FreeBSD 8.0-RELEASE-p2 i386
>Organization:
>Environment:
System: FreeBSD sushi.pseudo.local 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #5: Fri Jan 15 19:16:49 CET 2010 tobi@sushi.pseudo.local:/usr/obj/usr/src/sys/SUSHI i386
>Description:
Since http://svn.freebsd.org/changeset/base/191720 it's no longer needed to disable the whole APIC
subsystem to use CPU idle states C3 and deeper, it's sufficient to disable the LAPIC timer. I cc'ed
mav@ who implemented this feature to veto this PR if my statement is invalid.
Also I'm quite sure the LAPIC conflicts are not relevant for CPU idle state C2 but only for C3 and
deeper.
>How-To-Repeat:
>Fix:
--- share_man_man4_acpi.4.diff begins here ---
--- /usr/src/share/man/man4/acpi.4 2009-11-26 20:09:36.000000000 +0100
+++ share/man/man4/acpi.4 2010-05-29 12:16:21.000000000 +0200
@@ -592,10 +592,8 @@
.Nm
CPU idle power management drive conflicts with the local APIC (LAPIC)
timer.
-Disable APIC mode with
-.Va hint.apic.0.disabled
+Disable the local APIC timer with
+.Va hint.apic.0.clock=0
or do not use the
-.Li C2
-and
.Li C3
-states if APIC mode is enabled.
+and deeper states if the local APIC timer is enabled.
--- share_man_man4_acpi.4.diff ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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