linux-kernel - Re: [PATCH net-next v2 0/3] tun: AF

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Date: Wed, 28 Feb 2024 13:36:19 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Yunjian Wang <wangyunjian@...wei.com>
Cc: 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, 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
Subject: Re: [PATCH net-next v2 0/3] tun: AF_XDP Tx zero-copy support

Wed, Feb 28, 2024 at 12:04:41PM CET, wangyunjian@...wei.com wrote:
>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

Threading of the patchset seems to be broken. Did you by any chance send
this with "--nothread" git-send-email option?
pw seems to cope fine with this though.


>
> 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
>
>