linux-kernel - Re: [PATCH] net : rps : supoort a single flow to use rps

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Message-ID: <20220628101532.1be4a9df@kernel.org>
Date:   Tue, 28 Jun 2022 10:15:32 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Albert Huang <huangjie.albert@...edance.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Petr Machata <petrm@...dia.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Antoine Tenart <atenart@...nel.org>,
        Phil Auld <pauld@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Xin Long <lucien.xin@...il.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net : rps : supoort a single flow to use rps

On Tue, 28 Jun 2022 17:31:12 +0200 Eric Dumazet wrote:
> > how to use:
> > echo xxx > /sys/class/net/xxx/queues/rx-x/rps_cpus
> > echo 1 > /sys/class/net/xxx/queues/rx-x/rps_single_flow
> > and create a flow node with the function:
> > rps_flow_node_create  
> 
> Which part calls rps_flow_node_create() exactly ?
> 
> This seems to be very specialized to IPSEC.
> 
> Can IPSEC  use multiple threads for decryption ?

+1 Doesn't wireguard do something to spread the load across CPUs?
Maybe it can be generalized? I don't think a solution to "spray 
crypto around" belongs as part of RPS.