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(parent: 520cc68) | patch
x86: Use deep C states for off-lined CPUs
authorBoris Ostrovsky <boris.ostrovsky@amd.com>
Wed, 7 Mar 2012 07:30:30 +0000 (07:30 +0000)
committerBoris Ostrovsky <boris.ostrovsky@amd.com>
Wed, 7 Mar 2012 07:30:30 +0000 (07:30 +0000)
commit92ba85ec925abeb25b7176d4963b3d7d4126e898
tree875efe33230ae56437a41cda9210e4b01fb80a47tree | snapshot
parent520cc68bac404b374596a550dbf5cf54beb30b8bcommit | diff
x86: Use deep C states for off-lined CPUs

Currently when a core is taken off-line it is placed in C1 state
(unless MONITOR/MWAIT is used). This patch allows a core to go to
deeper C states resulting in significantly higher power savings.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
Committed-by: Keir Fraser <keir@xen.org>
xen/arch/x86/acpi/cpu_idle.c diff | blob | history
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