Re: [PATCH v4] event/cnxk: use WFE LDP loop for getwork routine

[Jerin Jacob <jerinjacobk@gmail.com>]

On Fri, Feb 2, 2024 at 5:59 AM <pbhagavatula@marvell.com> wrote:
>
> From: Pavan Nikhilesh <pbhagavatula@marvell.com>
>
> Use WFE LDP loop while polling for GETWORK completion for better
> power savings.

> Disabled by default and can be enabled by configuring meson with
> -Dc_args='-DRTE_ARM_USE_WFE'.

Since this section is not yet merged. We can remove this commit log.

>
> Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
> ---
>  v4 Changes:
>  - Split patches
>
>  doc/guides/eventdevs/cnxk.rst     |  9 ++++++

Please update the release notes for this PMD feature.


>  drivers/event/cnxk/cn10k_worker.h | 52 +++++++++++++++++++++++++------
>  2 files changed, 52 insertions(+), 9 deletions(-)
>
> diff --git a/doc/guides/eventdevs/cnxk.rst b/doc/guides/eventdevs/cnxk.rst
> index cccb8a0304..04f5b5025b 100644
> --- a/doc/guides/eventdevs/cnxk.rst
> +++ b/doc/guides/eventdevs/cnxk.rst
> @@ -198,6 +198,15 @@ Runtime Config Options
>
>      -a 0002:0e:00.0,tim_eclk_freq=122880000-1000000000-0
>
> +Power Savings on CN10K
> +----------------------
> +
> +ARM cores can additionally use WFE when polling for transactions on SSO bus
> +to save power i.e., in the event dequeue call ARM core can enter WFE and exit
> +when either work has been scheduled or dequeue timeout has reached.
> +This can be enabled by configuring meson with the following option
> +``-Dc_args='-DRTE_ARM_USE_WFE'``.

The last section can be made as generic, as other patches are not merged.
i.e This can be enabled by selecting RTE_ARM_USE_WFE or so.