netdev - Re: [RFC v2] net/core: add optional threading for rps backlog processing

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Message-ID: <CANn89iJXjEWJcFbSMwKOXuupCVr4b-y4Gh+LwOQg+TQwJPQ=eg@mail.gmail.com>
Date:   Fri, 17 Feb 2023 13:23:30 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Felix Fietkau <nbd@....name>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2] net/core: add optional threading for rps backlog processing

On Fri, Feb 17, 2023 at 11:06 AM Felix Fietkau <nbd@....name> wrote:
>
> When dealing with few flows or an imbalance on CPU utilization, static RPS
> CPU assignment can be too inflexible. Add support for enabling threaded NAPI
> for RPS backlog processing in order to allow the scheduler to better balance
> processing. This helps better spread the load across idle CPUs.
>
> Signed-off-by: Felix Fietkau <nbd@....name>
> ---
>
> RFC v2:
>  - fix rebase error in rps locking

Why only deal with RPS ?

It seems you propose the sofnet_data backlog be processed by a thread,
instead than from softirq ?