From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net-next V4 0/6] switch to use tx skb array in tun Date: Thu, 30 Jun 2016 14:45:30 +0800 Message-ID: <1467269136-8082-1-git-send-email-jasowang__8275.28508748419$1467269155$gmane$org@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: mst@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net Cc: brouer@redhat.com, eric.dumazet@gmail.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org 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 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