netdev - virtio-net + BQL

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Message-Id: <1708678175.1740165-3-xuanzhuo@linux.alibaba.com>
Date: Fri, 23 Feb 2024 16:49:35 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Dave Taht <dave.taht@...il.com>
Cc: "Jason Wang" <jasowang@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
    hengqi@...ux.alibaba.com, netdev@...r.kernel.org
Subject: virtio-net + BQL

Hi Dave,

We study the BQL recently.

For virtio-net, the skb orphan mode is the problem for the BQL. But now, we have
netdim, maybe it is time for a change. @Heng is working for the netdim.

But the performance number from https://lwn.net/Articles/469652/ has not appeal
to me.

The below number is good, but that just work when the nic is busy.

	No BQL, tso on: 3000-3200K bytes in queue: 36 tps
	BQL, tso on: 156-194K bytes in queue, 535 tps

Or I miss something.

Thanks.