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Message-ID: <1709118281-125508-1-git-send-email-wangyunjian@huawei.com>
Date: Wed, 28 Feb 2024 19:04:41 +0800
From: Yunjian Wang <wangyunjian@...wei.com>
To: <mst@...hat.com>, <willemdebruijn.kernel@...il.com>,
<jasowang@...hat.com>, <kuba@...nel.org>, <bjorn@...nel.org>,
<magnus.karlsson@...el.com>, <maciej.fijalkowski@...el.com>,
<jonathan.lemon@...il.com>, <davem@...emloft.net>
CC: <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
<virtualization@...ts.linux.dev>, <xudingke@...wei.com>,
<liwei395@...wei.com>, Yunjian Wang <wangyunjian@...wei.com>
Subject: [PATCH net-next v2 0/3] tun: AF_XDP Tx zero-copy support
Hi all:
Now, some drivers support the zero-copy feature of AF_XDP sockets,
which can significantly reduce CPU utilization for XDP programs.
This patch set allows TUN to also support the AF_XDP Tx zero-copy
feature. It is based on Linux 6.8.0+(openEuler 23.09) and has
successfully passed Netperf and Netserver stress testing with
multiple streams between VM A and VM B, using AF_XDP and OVS.
The performance testing was performed on a Intel E5-2620 2.40GHz
machine. Traffic were generated/send through TUN(testpmd txonly
with AF_XDP) to VM (testpmd rxonly in guest).
+------+---------+---------+---------+
| | copy |zero-copy| speedup |
+------+---------+---------+---------+
| UDP | Mpps | Mpps | % |
| 64 | 2.5 | 4.0 | 60% |
| 512 | 2.1 | 3.6 | 71% |
| 1024 | 1.9 | 3.3 | 73% |
+------+---------+---------+---------+
Yunjian Wang (3):
xsk: Remove non-zero 'dma_page' check in xp_assign_dev
vhost_net: Call peek_len when using xdp
tun: AF_XDP Tx zero-copy support
drivers/net/tun.c | 177 ++++++++++++++++++++++++++++++++++++++--
drivers/vhost/net.c | 21 +++--
include/linux/if_tun.h | 32 ++++++++
net/xdp/xsk_buff_pool.c | 7 --
4 files changed, 220 insertions(+), 17 deletions(-)
--
2.41.0
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