lkml.org 
[lkml]   [2016]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH net-next V4 0/6] switch to use tx skb array in tun
Date
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

\
 
 \ /
  Last update: 2016-06-30 09:41    [W:0.748 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site