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[Xen-devel] [PATCH 7/9] Add cpu idle pwr mgmt to xen

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Wei, Gang" <gang.wei@xxxxxxxxx>
  • Date: Fri, 25 Apr 2008 13:08:59 +0800
  • Delivery-date: Thu, 24 Apr 2008 22:14:23 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcimkngrQ6lM6BwSTl6IssdXQAGTAw==
  • Thread-topic: [PATCH 7/9] Add cpu idle pwr mgmt to xen
Add acpi C3 support for x86.

C3 & deep C state will need to do ARB_DIS or cache flush. ARB_DIS should
be done within the last cpu which is ready for C3. Bus master activities
are checked and recorded for C state promotion/demotion judgement.

C3 is disabled by default, till TSC/APIC stop issues resolved.
Adding cmdline option "max_cstate=3" can enable C3.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>

Attachment: xen-4-deepc-0425.patch
Description: xen-4-deepc-0425.patch

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