> -----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. > 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
