[dpdk-dev] [PATCH] build: enable packet data prefetch

[Stephen Hemminger]

On Tue, 22 Sep 2020 16:21:35 +0800
Marvin Liu <yong.liu at intel.com> wrote:

> Data prefetch instruction can preload data into cpu’s hierarchical
> cache before data access. Virtualized data paths like virtio utilized
> this feature for acceleration. Since most modern cpus have support
> prefetch function, we can enable packet data prefetch as default.
> 
> Signed-off-by: Marvin Liu <yong.liu at intel.com>
> 
> diff --git a/config/meson.build b/config/meson.build
> index 69f2aeb605..a0c828a437 100644
> --- a/config/meson.build
> +++ b/config/meson.build
> @@ -109,6 +109,9 @@ if not is_windows
>  	add_project_link_arguments('-Wl,--no-as-needed', language: 'c')
>  endif
>  
> +# do prefetch of packet data
> +dpdk_conf.set('RTE_PMD_PACKET_PREFETCH', 1)
> +
>  # use pthreads if available for the platform
>  if not is_windows
>  	add_project_link_arguments('-pthread', language: 'c')

With meson, the project has been using rte_config.h for this.