John Fastabend
2021-Feb-18 06:08 UTC
[PATCH v7 bpf-next 0/6] xsk: build skb by page (aka generic zerocopy xmit)
Alexander Lobakin wrote:> This series introduces XSK generic zerocopy xmit by adding XSK umem > pages as skb frags instead of copying data to linear space. > The only requirement for this for drivers is to be able to xmit skbs > with skb_headlen(skb) == 0, i.e. all data including hard headers > starts from frag 0. > To indicate whether a particular driver supports this, a new netdev > priv flag, IFF_TX_SKB_NO_LINEAR, is added (and declared in virtio_net > as it's already capable of doing it). So consider implementing this > in your drivers to greatly speed-up generic XSK xmit.[...]> ---------------- Performance Testing ------------ > > The test environment is Aliyun ECS server. > Test cmd: > ``` > xdpsock -i eth0 -t -S -s <msg size> > ``` > > Test result data: > > size 64 512 1024 1500 > copy 1916747 1775988 1600203 1440054 > page 1974058 1953655 1945463 1904478 > percent 3.0% 10.0% 21.58% 32.3% >For the series, but might be good to get Dave or Jakub to check 2/6 to be sure they agree. Acked-by: John Fastabend <john.fastabend at gmail.com>