From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Wang <jasowang@redhat.com>
Subject: Re: [RFC 0/7] PMD driver for AF_XDP
Date: Thu, 1 Mar 2018 10:52:19 +0800
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To: Qi Zhang <qi.z.zhang@intel.com>, dev@dpdk.org
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On 2018年02月27日 17:32, Qi Zhang wrote:
> The RFC patches add a new PMD driver for AF_XDP which is a proposed
> faster version of AF_PACKET interface in Linux, see below link for
> detail AF_XDP introduction:
> https://fosdem.org/2018/schedule/event/af_xdp/
> https://lwn.net/Articles/745934/
>
> This patchset is base on v18.02.
> It also require a linux kernel that have below AF_XDP RFC patches be
> applied.
> https://patchwork.ozlabs.org/patch/867961/
> https://patchwork.ozlabs.org/patch/867960/
> https://patchwork.ozlabs.org/patch/867938/
> https://patchwork.ozlabs.org/patch/867939/
> https://patchwork.ozlabs.org/patch/867940/
> https://patchwork.ozlabs.org/patch/867941/
> https://patchwork.ozlabs.org/patch/867942/
> https://patchwork.ozlabs.org/patch/867943/
> https://patchwork.ozlabs.org/patch/867944/
> https://patchwork.ozlabs.org/patch/867945/
> https://patchwork.ozlabs.org/patch/867946/
> https://patchwork.ozlabs.org/patch/867947/
> https://patchwork.ozlabs.org/patch/867948/
> https://patchwork.ozlabs.org/patch/867949/
> https://patchwork.ozlabs.org/patch/867950/
> https://patchwork.ozlabs.org/patch/867951/
> https://patchwork.ozlabs.org/patch/867952/
> https://patchwork.ozlabs.org/patch/867953/
> https://patchwork.ozlabs.org/patch/867954/
> https://patchwork.ozlabs.org/patch/867955/
> https://patchwork.ozlabs.org/patch/867956/
> https://patchwork.ozlabs.org/patch/867957/
> https://patchwork.ozlabs.org/patch/867958/
> https://patchwork.ozlabs.org/patch/867959/
>
> There is no clean upstream target yet since kernel patch is still in
> RFC stage, The purpose of the patchset is just for anyone that want to
> eveluate af_xdp with DPDK application and get feedback for further
> improvement.
>
> To try with the new PMD
> 1. compile and install the kernel with above patches applied.
> 2. configure $LINUX_HEADER_DIR (dir of "make headers_install")
>     and $TOOLS_DIR (dir at <kernel_src>/tools) at driver/net/af_xdp/Makefile
>     before compile DPDK.
> 3. make sure libelf and libbpf is installed.
>
> BTW, performance test shows our PMD can reach 94%~98% of the orignal benchmark
> when share memory is enabled.

Hi:

Looks like zerocopy is not used in this series. Any plan to support 
that? If not, what's the advantage compared to vhost-net + tap + 
XDP_REDIRECT?

Have you measured l2fwd performance in this case? I believe the number 
you refer here is rxdrop (XDP_DRV) which is 11.6Mpps.

Thanks