netdev - [PATCH net-next 0/5] virtio-net: support dynamic coalescing moderation

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Date: Thu, 12 Oct 2023 15:44:04 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paolo Abeni <pabeni@...hat.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Jakub Kicinski <kuba@...nel.org>,
	Simon Horman <horms@...nel.org>,
	"Liu, Yujie" <yujie.liu@...el.com>
Subject: [PATCH net-next 0/5] virtio-net: support dynamic coalescing moderation

Now, virtio-net already supports per-queue moderation parameter
setting. Based on this, we use the netdim library of linux to support
dynamic coalescing moderation for virtio-net.

Due to hardware scheduling issues, we only tested rx dim.

@Test env
rxq0 has affinity to cpu0.

@Test cmd
client: taskset -c 0 sockperf tp -i ${IP} -t 30 --tcp -m ${msg_size}
server: taskset -c 0 sockperf sr --tcp

@Test res
The second column is the ratio of the result returned by client
when rx dim is enabled to the result returned by client when
rx dim is disabled.
	--------------------------------------
	| msg_size |  rx_dim=on / rx_dim=off |
	--------------------------------------
	|   14B    |         + 3%            |   
	--------------------------------------
	|   100B   |         + 16%           |
	--------------------------------------
	|   500B   |         + 25%           |
	--------------------------------------
	|   1400B  |         + 28%           |
	--------------------------------------
	|   2048B  |         + 22%           |
	--------------------------------------
	|   4096B  |         + 5%            |
	--------------------------------------

---
This patch set was part of the previous netdim patch set[1].
[1] was split into a merged bugfix set[2] and the current set.
The previous relevant commentators have been Cced.

[1] https://lore.kernel.org/all/20230811065512.22190-1-hengqi@linux.alibaba.com/
[2] https://lore.kernel.org/all/cover.1696745452.git.hengqi@linux.alibaba.com/

Heng Qi (5):
  virtio-net: returns whether napi is complete
  virtio-net: separate rx/tx coalescing moderation cmds
  virtio-net: extract virtqueue coalescig cmd for reuse
  virtio-net: support rx netdim
  virtio-net: support tx netdim

 drivers/net/virtio_net.c | 394 ++++++++++++++++++++++++++++++++-------
 1 file changed, 322 insertions(+), 72 deletions(-)

-- 
2.19.1.6.gb485710b