[dpdk-dev] [PATCH] net/af_xdp: enable support for unaligned umem chunks

[Loftus, Ciara]

> 
> This patch enables the unaligned chunks feature for AF_XDP which allows
> chunks to be placed at arbitrary places in the umem, as opposed to them
> being required to be aligned to 2k. This allows for DPDK application
> mempools to be mapped directly into the umem and in turn enable zero
> copy transfer between umem and the PMD.
> 
> This patch replaces the zero copy via external mbuf mechanism introduced in
> commit e9ff8bb71943 ("net/af_xdp: enable zero copy by external mbuf").
> The pmd_zero copy vdev argument is also removed as now the PMD will
> auto-detect presence of the unaligned chunks feature and enable it if so and
> otherwise fall back to copy mode if not detected.
> 
> When enabled, this feature significantly improves single-core performance
> of the PMD.
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
> Signed-off-by: Kevin Laatz <kevin.laatz at intel.com>
> ---

Apologies for omitting this detail from the original mail.
Those wishing to try out this feature need to first apply this series which is currently under review to their kernel tree:
https://lore.kernel.org/bpf/20190827022531.15060-1-kevin.laatz@intel.com/T/#u

Thanks,
Ciara