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Date: Tue, 14 Nov 2023 13:55:42 +0800
From: Heng Qi <>
Cc: Jason Wang <>,
	"Michael S . Tsirkin" <>,
	Eric Dumazet <>,
	Paolo Abeni <>,
	"David S . Miller" <>,
	Jesper Dangaard Brouer <>,
	John Fastabend <>,
	Alexei Starovoitov <>,
	Simon Horman <>,
	Jakub Kicinski <>,
Subject: [PATCH net-next v3 0/5] virtio-net: support dynamic coalescing moderation

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

Due to some scheduling issues, we only support and test the rx dim.

Some test results:

I. Sockperf UDP
1. Env
rxq_0 with affinity to cpu_0.

2. Cmd
client: taskset -c 0 sockperf tp -p 8989 -i $IP -t 10 -m 16B
server: taskset -c 0 sockperf sr -p 8989

3. Result
dim off: 1143277.00 rxpps, throughput 17.844 MBps, cpu is 100%.
dim on:  1124161.00 rxpps, throughput 17.610 MBps, cpu is 83.5%.

II. Redis
1. Env
There are 8 rxqs, and rxq_i with affinity to cpu_i.

2. Result
When all cpus are 100%, ops/sec of memtier_benchmark client is
dim off:  978437.23
dim on:  1143638.28

III. Nginx
1. Env
There are 8 rxqs and rxq_i with affinity to cpu_i.

2. Result
When all cpus are 100%, requests/sec of wrk client is
dim off:  877931.67
dim on:  1019160.31

IV. Latency of sockperf udp
1. Rx cmd
taskset -c 0 sockperf sr -p 8989

2. Tx cmd
taskset -c 0 sockperf pp -i ${ip} -p 8989 -t 10

After running this cmd 5 times and averaging the results,

3. Result
dim off: 17.7735 usec
dim on:  18.0110 usec

- Patch(4/5): some minor modifications.

- Patch(2/5): a minor fix.
- Patch(4/5):
   - improve the judgment of dim switch conditions.
   - fix safe problem of work thread.
- Patch(5/5): drop the tx dim implementation.

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: return -EOPNOTSUPP for adaptive-tx

 drivers/net/virtio_net.c | 335 ++++++++++++++++++++++++++++++++-------
 1 file changed, 278 insertions(+), 57 deletions(-)


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