On 16-06-15 04:38 AM, Jason Wang wrote: > 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 > So this is more exercising the skb array improvements. For tun it would be useful to see general performance numbers on user/kernel crossing (i.e tun read/write). If you have the cycles can you run such tests? cheers, jamal -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
