netdev - Re: [PATCH v4 net-next 0/4] net: introduce rps_default

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Date:   Thu, 9 Feb 2023 12:25:02 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v4 net-next 0/4] net: introduce rps_default_mask

On Tue, Feb 7, 2023 at 7:46 PM Paolo Abeni <pabeni@...hat.com> wrote:
>
> Real-time setups try hard to ensure proper isolation between time
> critical applications and e.g. network processing performed by the
> network stack in softirq and RPS is used to move the softirq
> activity away from the isolated core.
>
> If the network configuration is dynamic, with netns and devices
> routinely created at run-time, enforcing the correct RPS setting
> on each newly created device allowing to transient bad configuration
> became complex.
>
> Additionally, when multi-queue devices are involved, configuring rps
> in user-space on each queue easily becomes very expensive, e.g.
> some setups use veths with per cpu queues.
>
> These series try to address the above, introducing a new
> sysctl knob: rps_default_mask. The new sysctl entry allows
> configuring a netns-wide RPS mask, to be enforced since receive
> queue creation time without any fourther per device configuration
> required.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>