On 2018年03月01日 12:20, Zhang, Qi Z wrote:
+Magnus, since a typo in my first batch in email address.
-----Original Message-----
From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Zhang, Qi Z
Sent: Thursday, March 1, 2018 12:19 PM
To: Jason Wang<jasow...@redhat.com>;dev@dpdk.org
Cc:magnus.karls...@intei.com; Topel, Bjorn<bjorn.to...@intel.com>
Subject: Re: [dpdk-dev] [RFC 0/7] PMD driver for AF_XDP
-----Original Message-----
From: Jason Wang [mailto:jasow...@redhat.com]
Sent: Thursday, March 1, 2018 10:52 AM
To: Zhang, Qi Z<qi.z.zh...@intel.com>;dev@dpdk.org
Cc:magnus.karls...@intei.com; Topel, Bjorn<bjorn.to...@intel.com>
Subject: Re: [dpdk-dev] [RFC 0/7] PMD driver for AF_XDP
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 zero copy is not used in this series. Any plan to support that?
Zero copy is enabled in patch 5, if a mempool passed check_mempool, it will
be registered to af_xdp socket.
so there will be no memcpy between mbuf and af_xdp.
Aha, I see. So the zerocopy was limited to some specific use case. And
if I understand it correctly, zc mode could not be used for VM.
Thanks
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.
Actually we measure the performance on rxonly / txonly / l2fwd on i40e with
XDP_SKB and XDP_DRV_ZC
Regards
Qi
Thanks
