netdev - Re: [RFC PATCH net-next 0/2] net: Use SMP threads for backlog NAPI.

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Message-ID: <20230814112421.5a2fa4f6@kernel.org>
Date: Mon, 14 Aug 2023 11:24:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner
 <tglx@...utronix.de>, Wander Lairson Costa <wander@...hat.com>
Subject: Re: [RFC PATCH net-next 0/2] net: Use SMP threads for backlog NAPI.

On Mon, 14 Aug 2023 11:35:26 +0200 Sebastian Andrzej Siewior wrote:
> The RPS code and "deferred skb free" both send IPI/ function call
> to a remote CPU in which a softirq is raised. This leads to a warning on
> PREEMPT_RT because raising softiqrs from function call led to undesired
> behaviour in the past. I had duct tape in RT for the "deferred skb free"
> and Wander Lairson Costa reported the RPS case.

Could you find a less invasive solution?
backlog is used by veth == most containerized environments.
This change has a very high risk of regression for a lot of people.