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Tsirkin" To: Yunjian Wang Cc: willemdebruijn.kernel@gmail.com, jasowang@redhat.com, kuba@kernel.org, bjorn@kernel.org, magnus.karlsson@intel.com, maciej.fijalkowski@intel.com, jonathan.lemon@gmail.com, davem@davemloft.net, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux.dev, xudingke@huawei.com, liwei395@huawei.com Subject: Re: [PATCH net-next v2 0/3] tun: AF_XDP Tx zero-copy support Message-ID: <20240228133035-mutt-send-email-mst@kernel.org> References: <1709118281-125508-1-git-send-email-wangyunjian@huawei.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <1709118281-125508-1-git-send-email-wangyunjian@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Feb 28, 2024 at 07:04:41PM +0800, Yunjian Wang wrote: > Hi all: > > Now, some drivers support the zero-copy feature of AF_XDP sockets, > which can significantly reduce CPU utilization for XDP programs. > > This patch set allows TUN to also support the AF_XDP Tx zero-copy > feature. It is based on Linux 6.8.0+(openEuler 23.09) and has > successfully passed Netperf and Netserver stress testing with > multiple streams between VM A and VM B, using AF_XDP and OVS. > > The performance testing was performed on a Intel E5-2620 2.40GHz > machine. Traffic were generated/send through TUN(testpmd txonly > with AF_XDP) to VM (testpmd rxonly in guest). > > +------+---------+---------+---------+ > | | copy |zero-copy| speedup | > +------+---------+---------+---------+ > | UDP | Mpps | Mpps | % | > | 64 | 2.5 | 4.0 | 60% | > | 512 | 2.1 | 3.6 | 71% | > | 1024 | 1.9 | 3.3 | 73% | > +------+---------+---------+---------+ > > Yunjian Wang (3): > xsk: Remove non-zero 'dma_page' check in xp_assign_dev > vhost_net: Call peek_len when using xdp > tun: AF_XDP Tx zero-copy support threading broken pls repost. vhost bits look ok though: Acked-by: Michael S. Tsirkin > drivers/net/tun.c | 177 ++++++++++++++++++++++++++++++++++++++-- > drivers/vhost/net.c | 21 +++-- > include/linux/if_tun.h | 32 ++++++++ > net/xdp/xsk_buff_pool.c | 7 -- > 4 files changed, 220 insertions(+), 17 deletions(-) > > -- > 2.41.0