On Wed, 22 Dec 2021 08:55:22 -0800 Stephen Hemminger <step...@networkplumber.org> wrote:
> On Wed, 22 Dec 2021 08:54:00 +0800 > Yanling Song <son...@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.
