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* [PATCH io_uring-next/net-next v2 0/4] implement io_uring notification (ubuf_info) stacking
@ 2024-04-19 11:08 Pavel Begunkov
  2024-04-19 11:08 ` [PATCH io_uring-next/net-next v2 1/4] net: extend ubuf_info callback to ops structure Pavel Begunkov
                   ` (6 more replies)
  0 siblings, 7 replies; 10+ messages in thread
From: Pavel Begunkov @ 2024-04-19 11:08 UTC (permalink / raw)
  To: io-uring, netdev
  Cc: Jens Axboe, asml.silence, David S . Miller, Jakub Kicinski,
	David Ahern, Eric Dumazet, Willem de Bruijn, Jason Wang, Wei Liu,
	Paul Durrant, xen-devel, Michael S . Tsirkin, virtualization, kvm

Please, don't take directly, conflicts with io_uring.

To have per request buffer notifications each zerocopy io_uring send
request allocates a new ubuf_info. However, as an skb can carry only
one uarg, it may force the stack to create many small skbs hurting
performance in many ways.

The patchset implements notification, i.e. an io_uring's ubuf_info
extension, stacking. It attempts to link ubuf_info's into a list,
allowing to have multiple of them per skb.

liburing/examples/send-zerocopy shows up 6 times performance improvement
for TCP with 4KB bytes per send, and levels it with MSG_ZEROCOPY. Without
the patchset it requires much larger sends to utilise all potential.

bytes  | before | after (Kqps)
1200   | 195    | 1023
4000   | 193    | 1386
8000   | 154    | 1058

The patches are on top of net-next + io_uring-next:

https://github.com/isilence/linux.git iou-sendzc/notif-stacking-v2

First two patches based on net-next:

https://github.com/isilence/linux.git iou-sendzc/notif-stacking-v2-netonly

v2: convert xen-netback to ubuf_info_ops (patch 1)
    drop two separately merged io_uring patches

Pavel Begunkov (4):
  net: extend ubuf_info callback to ops structure
  net: add callback for setting a ubuf_info to skb
  io_uring/notif: simplify io_notif_flush()
  io_uring/notif: implement notification stacking

 drivers/net/tap.c                   |  2 +-
 drivers/net/tun.c                   |  2 +-
 drivers/net/xen-netback/common.h    |  5 +-
 drivers/net/xen-netback/interface.c |  2 +-
 drivers/net/xen-netback/netback.c   | 11 ++--
 drivers/vhost/net.c                 |  8 ++-
 include/linux/skbuff.h              | 21 +++++---
 io_uring/notif.c                    | 83 +++++++++++++++++++++++++----
 io_uring/notif.h                    | 12 ++---
 net/core/skbuff.c                   | 36 ++++++++-----
 10 files changed, 134 insertions(+), 48 deletions(-)

-- 
2.44.0


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2024-04-23  1:36 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-04-19 11:08 [PATCH io_uring-next/net-next v2 0/4] implement io_uring notification (ubuf_info) stacking Pavel Begunkov
2024-04-19 11:08 ` [PATCH io_uring-next/net-next v2 1/4] net: extend ubuf_info callback to ops structure Pavel Begunkov
2024-04-22 16:59   ` Willem de Bruijn
2024-04-19 11:08 ` [PATCH io_uring-next/net-next v2 2/4] net: add callback for setting a ubuf_info to skb Pavel Begunkov
2024-04-22 17:01   ` Willem de Bruijn
2024-04-19 11:08 ` [PATCH io_uring-next/net-next v2 3/4] io_uring/notif: simplify io_notif_flush() Pavel Begunkov
2024-04-19 11:08 ` [PATCH io_uring-next/net-next v2 4/4] io_uring/notif: implement notification stacking Pavel Begunkov
2024-04-19 11:21 ` [PATCH io_uring-next/net-next v2 0/4] implement io_uring notification (ubuf_info) stacking Pavel Begunkov
2024-04-23  0:20 ` patchwork-bot+netdevbpf
2024-04-23  1:36 ` (subset) " Jens Axboe

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