[Bloat] Re: [Cake] "Fi-Wi is a new forwarding plane for wireless" - Bob McMahon

[Frantisek Borsik <frantisek.borsik@gmail.com>]

Thanks, David. Bob's latest slide deck can add more info on this:
https://www.umbernetworks.com/DPDK_WiFi_Stockholm_Pres.html

He is here, but I'm adding him directly.

All the best,

Frank

Frantisek (Frank) Borsik


*In loving memory of Dave Täht: *1965-2025

https://libreqos.io/2025/04/01/in-loving-memory-of-dave/


https://www.linkedin.com/in/frantisekborsik

Signal, Telegram, WhatsApp: +421919416714

iMessage, mobile: +420775230885

Skype: casioa5302ca

frantisek.borsik@gmail.com


On Thu, May 14, 2026 at 7:09 PM David Lang <david@lang.hm> wrote:

> This approach seems like it would work when you have one or a small number
> of
> fi-wi routers covering an area and the users are static
>
> but that's bad RF engineering. having more different fixed stations really
> improves your RF performance. Combine that with devices moving around and
> you
> are not forwarding in the wifi layer, you need to forward based on where
> the
> stations are. For that, the IP address (and trditional IP routing) would
> seem to
> be the answer,
>
> Even when looking at transmissions to multiple stations (I assume that's
> what is
> meant by aggregates), that depends on both what stations are where and
> what data
> there is to transmit. the groupings should not be even remotely static
>
> Now, I may have misunderstood things, and I am alwasys aware of the
> concept that
> the person saying that something can't be done shouldn't interfere with
> the
> person doing it, but this sounds like something that would work well in a
> lab
> and fail miserably outside of those very controlled conditions.
>
> David Lang
>
>
> On Thu, 14 May 2026, Frantisek Borsik wrote:
>
> > Interesting food for though:
> >
> > "Fi-Wi is a new forwarding plane for wireless.
> >
> > IP routing maps destination prefix → next hop. Ethernet bridging maps
> > learned MAC → port. Fi-Wi maps 802.3 aggregates (A-MPDU) → (RRH,
> orthogonal
> > slot), where an orthogonal "slot" spans time, carrier frequencies, and
> > eigenspaces.
> >
> > Current 802.11 needs a forwarding plane. CSMA/CA via APs is collision
> > avoidance — delivery is emergent, no global state, no forwarding
> decision.
> > Fi-Wi replaces that with centralized decision-making running over
> > distributed Remote Radio Heads, connected via PCIe-over-fiber as
> > cache-coherent, switched DRAM. Every RRH's queue state, channel state,
> and
> > TSF clock visible to the scheduler in a single memory domain.
> >
> > Same architectural leap that IP made for L3 and Ethernet made for L2. A
> new
> > industry serviced by routers. Another new industry serviced by switches.
> > Fi-Wi isn't a new product, it's a third forwarding plane, and an industry
> > yet to be built.
> >
> > Umber Networks. The first company building Fi-Wi."
> >
> >
> https://www.linkedin.com/feed/update/urn:li:activity:7460693793390968832/
> >
> > All the best,
> >
> > Frank
> >
> > Frantisek (Frank) Borsik
> >
> >
> > *In loving memory of Dave Täht: *1965-2025
> >
> > https://libreqos.io/2025/04/01/in-loving-memory-of-dave/
> >
> >
> > https://www.linkedin.com/in/frantisekborsik
> >
> > Signal, Telegram, WhatsApp: +421919416714
> >
> > iMessage, mobile: +420775230885
> >
> > Skype: casioa5302ca
> >
> > frantisek.borsik@gmail.com
> > _______________________________________________
> > Cake mailing list -- cake@lists.bufferbloat.net
> > To unsubscribe send an email to cake-leave@lists.bufferbloat.net