From: Pavel Begunkov <asml.silence@gmail.com>
To: io-uring@vger.kernel.org, netdev@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>,
asml.silence@gmail.com, "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
Jason Wang <jasowang@redhat.com>, Wei Liu <wei.liu@kernel.org>,
Paul Durrant <paul@xen.org>,
xen-devel@lists.xenproject.org,
"Michael S . Tsirkin" <mst@redhat.com>,
virtualization@lists.linux.dev, kvm@vger.kernel.org
Subject: [PATCH io_uring-next/net-next v2 0/4] implement io_uring notification (ubuf_info) stacking
Date: Fri, 19 Apr 2024 12:08:38 +0100 [thread overview]
Message-ID: <cover.1713369317.git.asml.silence@gmail.com> (raw)
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
next reply other threads:[~2024-04-19 11:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-19 11:08 Pavel Begunkov [this message]
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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