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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-04-10 11:11:25 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-04-10 11:11:25 +0100 |
| commit | 49fd7b4410989ac653894b79fcee15f60d906cec (patch) | |
| tree | 351ee4855202762b5c3f27ec147ad4462e88a635 /xen/arch/x86/pci.c | |
| parent | dacde68ff12a8f71f9e8ad6e6053a93af4bf655a (diff) | |
| download | xen-49fd7b4410989ac653894b79fcee15f60d906cec.tar.gz xen-49fd7b4410989ac653894b79fcee15f60d906cec.tar.bz2 xen-49fd7b4410989ac653894b79fcee15f60d906cec.zip | |
x86: Conditionally disable PIT 100HZ timer interrupt
100HZ PIT timer interrupt set a 10ms upper limit for C state
residency, which makes Xen not power friendly. This patch disable PIT
timer interrupt in the conditions:
- CPU has APIC support, and
- PIT is not used as platform time source
Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Diffstat (limited to 'xen/arch/x86/pci.c')
0 files changed, 0 insertions, 0 deletions