netdev - Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding performance vs Core/RSS number / HT on

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Message-ID: <1506040635.29839.158.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Thu, 21 Sep 2017 17:37:15 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Paweł Staszewski <pstaszewski@...are.pl>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding
 performance vs Core/RSS number / HT on

On Thu, 2017-09-21 at 15:07 -0700, Florian Fainelli wrote:
> On 09/21/2017 02:54 PM, Eric Dumazet wrote:
> > On Thu, 2017-09-21 at 14:41 -0700, Florian Fainelli wrote:
> > 
> >> Would not this apply to pretty much any stacked device setup though? It
> >> seems like any network device that just queues up its packet on another
> >> physical device for actual transmission may need that (e.g: DSA, bond,
> >> team, more.?)
> > 
> > We support bonding and team already.
> 
> Right, so that seems to mostly leave us with DSA at least. What about
> other devices that also have IFF_NO_QUEUE set?

It wont work.

loopback has IFF_NO_QUEUE, but you need to keep dst on skbs...