[dpdk-dev] [PATCH v3 3/6] power: add simple power management API and callback

[Liang, Ma]

<snip>
Hi Stephen, 
    v4 will support 1 port with multiple core(still 1 queue per core)support
    this part description will be updated according to the design change.
Regards
Liang
> The common way to express is this is:
> 
> This API is not thread-safe and not preempt-safe.
> There is also no mechanism for a single thread to wait on multiple queues.
> 
> > 
> > This design leverage RX Callback mechnaism which allow three
> > different power management methodology co exist.
> 
> nit coexist is one word
> 
> > 
> > 1. umwait/umonitor:
> > 
> >    The TSC timestamp is automatically calculated using current
> >    link speed and RX descriptor ring size, such that the sleep
> >    time is not longer than it would take for a NIC to fill its
> >    entire RX descriptor ring.
> > 
> > 2. Pause instruction
> > 
> >    Instead of move the core into deeper C state, this lightweight
> >    method use Pause instruction to releaf the processor from
> >    busy polling.
> 
> Wording here is a problem, and "releaf" should be "relief"?
> Rewording into active voice grammar would be easier.
> 
>      Use Pause instruction to allow processor to go into deeper C
>      state when busy polling.
> 
> 
> 
> > 
> > 3. Frequency Scaling
> >    Reuse exist rte power library to scale up/down core frequency
> >    depend on traffic volume.
>