On Friday, December 05, 2014 11:09:29 AM Linda Knippers wrote: > On 12/5/2014 4:40 AM, Ethan Zhao wrote: > > To force loading on Oracle Sun X86 servers, provide one kernel command line > > parameter > > > > intel_pstate = force > > > > For those who be aware of the risk of no power capping capabily working and > > try to get better performance with this driver. > > > > Signed-off-by: Ethan Zhao <ethan.z...@oracle.com> > > Tested-by: Alexey Kodanev <alexey.koda...@oracle.com> > > --- > > v2: change to hardware vendor specific naming parameter. > > v4: refine code and doc. > > v5&v6: fix a typo in doc. > > v7: change enum PCC to PPC. > > v8: change the name of kernel command line parameter to generic one. > > > > Documentation/kernel-parameters.txt | 5 +++++ > > drivers/cpufreq/intel_pstate.c | 6 +++++- > > 2 files changed, 10 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/kernel-parameters.txt > > b/Documentation/kernel-parameters.txt > > index 479f332..7d0983e 100644 > > --- a/Documentation/kernel-parameters.txt > > +++ b/Documentation/kernel-parameters.txt > > @@ -1446,6 +1446,11 @@ 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 where it may cause > > problems to > > + happen due to conflicts with platform firmware > > attempting to > > + drive P-states by itself in certain situations (for > > thermal > > + control or power capping in general or other purposes). > > I suggest something like: > 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-state information being > used by the OS and therefore should be used with care. > 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. > > Maybe this is too specific but I believe it is accurate. Comments?
Looks good to me, thanks! -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
