[dpdk-dev] [PATCH v2] config: enable packet data prefetch

[Thomas Monjalon]

23/09/2020 03:51, Marvin Liu:
> 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>
> ---
> +#define RTE_PMD_PACKET_PREFETCH 1

We could also remove the related #ifdefs.

What can be the drawback of always enable those prefetches?