netdev - Re: [PATCH v2 net-next] net: dev: Always serialize on Qdisc::busylock in __dev_xmit_skb() on PREEMPT

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Date:   Mon, 13 Dec 2021 15:00:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     kuba@...nel.org, netdev@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, tglx@...utronix.de
Subject: Re: [PATCH v2 net-next] net: dev: Always serialize on Qdisc::busylock in
 __dev_xmit_skb() on PREEMPT_RT.

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@...emloft.net>:

On Mon, 13 Dec 2021 11:53:29 +0100 you wrote:
> The root-lock is dropped before dev_hard_start_xmit() is invoked and after
> setting the __QDISC___STATE_RUNNING bit. If the Qdisc owner is preempted
> by another sender/task with a higher priority then this new sender won't
> be able to submit packets to the NIC directly instead they will be
> enqueued into the Qdisc. The NIC will remain idle until the Qdisc owner
> is scheduled again and finishes the job.
> 
> [...]

Here is the summary with links:
  - [v2,net-next] net: dev: Always serialize on Qdisc::busylock in __dev_xmit_skb() on PREEMPT_RT.
    https://git.kernel.org/netdev/net-next/c/64445dda9d83

You are awesome, thank you!
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