netdev - Re: [Bloat] Linux network is damn fast, need more use XDP (Was: DC behaviors today)

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Message-ID: <CAKiAkGS8SpCv=icr=q+7S7Us1h-QH_Wk1tP-XEYx1zYfvE9v1g@mail.gmail.com>
Date:   Tue, 5 Dec 2017 09:49:43 +1300
From:   Joel Wirāmu Pauling <joel@...ertia.net>
To:     Dave Taht <dave.taht@...il.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Dave Taht <dave@...t.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        bloat <bloat@...ts.bufferbloat.net>,
        Christina Jacob <christina.jacob.koikara@...il.com>,
        "cerowrt-devel@...ts.bufferbloat.net" 
        <cerowrt-devel@...ts.bufferbloat.net>,
        David Ahern <dsa@...ulusnetworks.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [Bloat] Linux network is damn fast, need more use XDP (Was: DC
 behaviors today)

On 5 December 2017 at 06:00, Dave Taht <dave.taht@...il.com> wrote:

>>> The route table lookup also really expensive on the main cpu.
>
> To clarify the context here, I was asking specifically if the X5 mellonox card
> did routing table offlload or only switching.
>
To clarify what I know the X5 using it's smart offload engine CAN do
L3 offload into the NIC - the X4's can't.

So for the Nuage OVS -> Eswitch (what mellanox calls the flow
programming) magic to happen and be useful we are going to need X5.

Mark Iskra gave a talk at Openstack summit which can be found here:

https://www.openstack.org/videos/sydney-2017/warp-speed-openvswitch-turbo-charge-vnfs-to-100gbps-in-nextgen-sdnnfv-datacenter

Slides here:

https://www.openstack.org/assets/presentation-media/OSS-Nov-2017-Warp-speed-Openvswitch-v6.pptx

Mark's local to you (Mountain View) - and is a nice guy, is probably
the better person to answer specifics.

-Joel