• Jason Wang's avatar
    tun: switch to use skb array for tx · 1576d986
    Jason Wang authored
    We used to queue tx packets in sk_receive_queue, this is less
    efficient since it requires spinlocks to synchronize between producer
    and consumer.
    
    This patch tries to address this by:
    
    - switch from sk_receive_queue to a skb_array, and resize it when
      tx_queue_len was changed.
    - introduce a new proto_ops peek_len which was used for peeking the
      skb length.
    - implement a tun version of peek_len for vhost_net to use and convert
      vhost_net to use peek_len if possible.
    
    Pktgen test shows about 15.3% improvement on guest receiving pps for small
    buffers:
    
    Before: ~1300000pps
    After : ~1500000pps
    Signed-off-by: 's avatarJason Wang <jasowang@redhat.com>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    1576d986
net.h 10.3 KB