On Thu, Jun 30, 2016 at 02:45:30PM +0800, Jason Wang wrote: > Hi all: > > This series tries to switch to use skb array in tun. This is used to > eliminate the spinlock contention between producer and consumer. The > conversion was straightforward: just introdce a tx skb array and use > it instead of sk_receive_queue. > > A minor issue is to keep the tx_queue_len behaviour, since tun used to > use it for the length of sk_receive_queue. This is done through: > > - add the ability to resize multiple rings at once to avoid handling > partial resize failure for mutiple rings. > - add the support for zero length ring. > - introduce a notifier which was triggered when tx_queue_len was > changed for a netdev. > - resize all queues during the tx_queue_len changing. > > Tests shows about 15% improvement on guest rx pps: > > Before: ~1300000pps > After : ~1500000pps Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> Acked-from-altitude: 34697 feet. > Changes from V3: > - fix kbuild warnings > - call NETDEV_CHANGE_TX_QUEUE_LEN on IFLA_TXQLEN > > Changes from V2: > - add multiple rings resizing support for ptr_ring/skb_array > - add zero length ring support > - introdce a NETDEV_CHANGE_TX_QUEUE_LEN > - drop new flags > > Changes from V1: > - switch to use skb array instead of a customized circular buffer > - add non-blocking support > - rename .peek to .peek_len > - drop lockless peeking since test show very minor improvement > > Jason Wang (5): > ptr_ring: support zero length ring > skb_array: minor tweak > skb_array: add wrappers for resizing > net: introduce NETDEV_CHANGE_TX_QUEUE_LEN > tun: switch to use skb array for tx > > Michael S. Tsirkin (1): > ptr_ring: support resizing multiple queues > > drivers/net/tun.c | 138 ++++++++++++++++++++++++++++++++++++--- > drivers/vhost/net.c | 16 ++++- > include/linux/net.h | 1 + > include/linux/netdevice.h | 1 + > include/linux/ptr_ring.h | 77 ++++++++++++++++++---- > include/linux/skb_array.h | 13 +++- > net/core/net-sysfs.c | 15 ++++- > net/core/rtnetlink.c | 16 +++-- > tools/virtio/ringtest/ptr_ring.c | 5 ++ > 9 files changed, 255 insertions(+), 27 deletions(-) > > -- > 2.7.4 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
