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 <mst@xxxxxxxxxx> > 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
