On Tue, Jun 19, 2018 at 11:03:22AM +0200, Thomas Gleixner wrote:
> On Fri, 15 Jun 2018, Fenghua Yu wrote:
> > By default C0.2 is enabled so user wait can save more power but wakeup
> > time is slower. In some cases e.g. real time, user wants to disable C0.2
> > so that user wait saves less power bu
On Fri, 15 Jun 2018, Fenghua Yu wrote:
> By default C0.2 is enabled so user wait can save more power but wakeup
> time is slower. In some cases e.g. real time, user wants to disable C0.2
> so that user wait saves less power but wakeup time is faster.
Why is this default enabled?
> A new "/sys/dev
UMWAIT or TPAUSE called by user process makes processor to reside in
a light-weight power/performance optimized state (C0.1 state) or an
improved power/performance optimized state (C0.2 state).
IA32_UMAIT_CONTROL MSR register control allows OS to set maximum umwait
time and disable C0.2 on the pro
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