From aa4ea34da9e7a2bc0fb98f5add3e4e52872b7d45 Mon Sep 17 00:00:00 2001 From: Ethan Zhao Date: Tue, 9 Dec 2014 10:43:19 +0900 Subject: intel_pstate: add kernel parameter to force loading To force loading on Oracle Sun X86 servers, provide one kernel command line parameter intel_pstate = force For those who are aware of the risk of no power capping capabily working and try to get better performance with this driver. Signed-off-by: Ethan Zhao Tested-by: Alexey Kodanev Reviewed-by: Linda Knippers Acked-by: Kristen Carlson Accardi Signed-off-by: Rafael J. Wysocki --- Documentation/kernel-parameters.txt | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'Documentation/kernel-parameters.txt') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 5fdf714f40a0..d006bb22f3ca 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1446,6 +1446,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. disable Do not enable intel_pstate as the default scaling driver for the supported processors + force + Enable intel_pstate on systems that prohibit it by default + in favor of acpi-cpufreq. Forcing the intel_pstate driver + instead of acpi-cpufreq may disable platform features, such + as thermal controls and power capping, that rely on ACPI + P-States information being indicated to OSPM and therefore + should be used with caution. This option does not work with + processors that aren't supported by the intel_pstate driver + or on platforms that use pcc-cpufreq instead of acpi-cpufreq. no_hwp Do not enable hardware P state control (HWP) if available. -- cgit v1.2.3