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

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Date: Wed, 25 Oct 2023 01:49:42 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.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

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.


> @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