Subject: Re: [PATCH net-next v7 9/9] tun/tap & vhost-net: avoid ptr_ring tail-drop when qdisc is present

From: "Michael S. Tsirkin" <[email-masked]>
Date: Sun, 11 Jan 2026 23:33:10 -0500

On Fri, Jan 09, 2026 at 11:14:54AM +0100, Simon Schippers wrote:
> Am I not allowed to stop the queue and then return NETDEV_TX_BUSY?

We jump through a lot of hoops in virtio_net to avoid using
NETDEV_TX_BUSY because that bypasses all the net/ cleverness.
Given your patches aim to improve precisely ring full,
I would say stopping proactively before NETDEV_TX_BUSY
should be a priority.

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MST