netdev - Re: [PATCH v4 net-next 0/4] net: Provide SMP threads for backlog NAPI

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Message-ID: <20240308153302.AmmDp45Q@linutronix.de>
Date: Fri, 8 Mar 2024 16:33:02 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wander Lairson Costa <wander@...hat.com>,
	Yan Zhai <yan@...udflare.com>
Subject: Re: [PATCH v4 net-next 0/4] net: Provide SMP threads for backlog NAPI

On 2024-03-05 12:53:18 [+0100], To netdev@...r.kernel.org 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.
> 
> This series only provides support for SMP threads for backlog NAPI, I
> did not attach a patch to make it default and remove the IPI related
> code to avoid confusion. I can post it for reference it asked.
> 
> The RedHat performance team was so kind to provide some testing here.
> The series (with the IPI code removed) has been tested and no regression
> vs without the series has been found. For testing iperf3 was used on 25G
> interface, provided by mlx5, ix40e or ice driver and RPS was enabled. I
> can provide the individual test results if needed.
> 
> Changes:
> - v3…v4 https://lore.kernel.org/all/20240228121000.526645-1-bigeasy@linutronix.de/

The v4 is marked as "Changes Requested". Is there anything for me to do?
I've been asked to rebase v3 on top of net-next which I did with v4. It
still applies onto net-next as of today.
 
Sebastian