[PATCH v2 2/3] event/cnxk: add pause to spinloops

[Stephen Hemminger]

On Mon, 8 Jun 2026 21:19:20 +0530
Jerin Jacob <jerinjacobk at gmail.com> wrote:

> On Mon, Apr 13, 2026 at 10:36 PM Stephen Hemminger
> <stephen at networkplumber.org> wrote:
> >
> > On SMT systems when a spinloop is done without a pause
> > it may cause excessive latency. This problem was found
> > by the fix_empty_spinloops coccinelle script.
> >
> > Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>  
> 
> rte_pause() translates to YIELD instruction. Since cnxk is an
> integrated SoC and it is a single threaded core, it won't help on
> anything other than adding one instruction bit more latency.
> In general 3/3 devtool is good. Please send a it separate version so
> that 3/3 patches can be merged through the main tree.


It matters if your SOC has SMT where two cores are sharing
and one core is waiting for its partner.