summaryrefslogtreecommitdiffstats
path: root/share
diff options
context:
space:
mode:
authorjkim <jkim@FreeBSD.org>2012-05-04 18:54:51 +0000
committerjkim <jkim@FreeBSD.org>2012-05-04 18:54:51 +0000
commit2ed237af622fef414c4b4510da5c0166d48422df (patch)
treec681463c456f657b376639ecca9ca18ef5384b07 /share
parentcbd8dc582eb04ebe1bde321b9235da1c1fa93c68 (diff)
downloadFreeBSD-src-2ed237af622fef414c4b4510da5c0166d48422df.zip
FreeBSD-src-2ed237af622fef414c4b4510da5c0166d48422df.tar.gz
Complete commit message for r235024:
Use MADT to match ACPI Processor objects to CPUs. MADT and DSDT/SSDTs may list CPUs in different orders, especially for disabled logical cores. Now we match ACPI IDs from the MADT with Processor objects, strictly order CPUs accordingly, and ignore disabled cores. This prevents us from executing methods for other CPUs, e. g., _PSS for disabled logical core, which may not exist. Unfortunately, it is known that there are a few systems with buggy BIOSes that do not have unique ACPI IDs for MADT and Processor objects. To work around these problems, 'debug.acpi.cpu_unordered' tunable is added. Set this to a non-zero value to restore the old behavior. Many thanks to jhb for pointing me to the right direction and the manual page change. Reported by: Harris, James R (james dot r dot harris at intel dot com) Tested by: Harris, James R (james dot r dot harris at intel dot com) Reviewed by: jhb MFC after: 1 month
Diffstat (limited to 'share')
-rw-r--r--share/man/man4/acpi.42
1 files changed, 1 insertions, 1 deletions
diff --git a/share/man/man4/acpi.4 b/share/man/man4/acpi.4
index 91b6517..9d57128 100644
--- a/share/man/man4/acpi.4
+++ b/share/man/man4/acpi.4
@@ -199,7 +199,7 @@ Enables loading of a custom ACPI DSDT.
.It Va acpi_dsdt_name
Name of the DSDT table to load, if loading is enabled.
.It Va debug.acpi.cpu_unordered
-Do not use the MADT to match ACPI processor objects to CPUs.
+Do not use the MADT to match ACPI Processor objects to CPUs.
This is needed on a few systems with a buggy BIOS that does not use
consistent processor IDs.
Default is 0 (disabled).
OpenPOWER on IntegriCloud