From: Jason Wang <jasow...@redhat.com> Date: Wed, 15 Jun 2016 16:38:17 +0800
> 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: > > - introduce a new mode which will be only enabled with IFF_TX_ARRAY > set and switch from sk_receive_queue to a fixed size of skb > array with 256 entries in this mode. > - 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 18% improvement on guest receiving pps for small > buffers: > > Before: ~1220000pps > After : ~1440000pps > > The reason why I stick to new mode is because: > > - though resize is supported by skb array, in multiqueue mode, it's > not easy to recover from a partial success of queue resizing. > - tx_queue_len is a user visible feature. > > Signed-off-by: Jason Wang <jasow...@redhat.com> Michael, can you please review this, especially as this is the first user of your new infrastructure :-)
