[PATCH v1 01/25] drivers/net: introduce a new PMD driver

[Yanling Song]

On Wed, 22 Dec 2021 08:55:22 -0800
Stephen Hemminger <stephen at networkplumber.org> wrote:

> On Wed, 22 Dec 2021 08:54:00 +0800
> Yanling Song <songyl at ramaxel.com> wrote:
> 
> > > If all you want is jiffie accuracy,  you could use
> > > CLOCK_MONOTONIC_COARSE.
> > >     
> > I did not get your point: CLOCK_MONOTONIC is more accurate than
> > CLOCK_MONOTONIC_COARSE, right?  
> 
> CLOCK_MONOTONIC ends up using the TSC counter and values in the
> shared page (VDSO) to compute time accurately.
> 
> CLOCK_MONOTONIC_COARSE is faster and good enough if you only
> want ms accuracy. It just reads a value from shared page
> and avoids the TSC instruction.

OK. Got it. Thanks. Will be included in the next version.