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

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Message-ID: <d215566f-8185-463b-aa0b-5925f2a0853c@linux.alibaba.com>
Date: Tue, 24 Oct 2023 20:02:48 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
 virtualization@...ts.linux-foundation.org,
 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: Re: [PATCH net-next 0/5] virtio-net: support dynamic coalescing
 moderation

在 2023/10/12 下午4:29, Jason Wang 写道:
> On Thu, Oct 12, 2023 at 3:44 PM Heng Qi <hengqi@...ux.alibaba.com> wrote:
>> 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.
> Do you have PPS numbers? And TX numbers are also important as the
> throughput could be misleading due to various reasons.

Hi Jason!

The comparison of rx netdim performance is as follows:
(the backend supporting tx dim is not yet ready)

I. Sockperf UDP
=================================================
1. Env
rxq_0 is 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 is 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 is 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
=================================================

Thanks!

>
> Thanks
>
>> @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
>>
>>