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

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Message-ID: <707be7fa-3bb7-46c5-bb34-ef2900fe473f@linux.alibaba.com>
Date: Wed, 1 Nov 2023 17:40:30 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...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 2023/10/25 下午1:49, Michael S. Tsirkin 写道:
> On Thu, Oct 12, 2023 at 03:44:04PM +0800, Heng Qi 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.
> So patches 1 to 4 look ok but patch 5 is untested - we should
> probably wait until it's tested properly.

Hi, Michael.

For a few reasons (reply to Jason's thread), I won't be trying to push 
tx dim any more in the short term.

Please review the remaining patches.

Thanks a lot!

>
>
>> @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