[Codel] Re: [Cake] Re: XDP2 is here - from one and only Tom Herbert (almost to the date, 10 years after XDP was released)

[Tom Herbert <tom@herbertland.com>]

On Tue, Sep 9, 2025, 5:03 PM Frantisek Borsik <frantisek.borsik@gmail.com>
wrote:

> Thanks a lot, David.
>
> I have asked Tom if he wants to join us and he should be here to chat with
> us now.
>
> 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 Tue, Sep 9, 2025 at 10:25 PM David P. Reed <dpreed@deepplum.com> wrote:
>
> > Hi Frank -
> >
> >
> >
> > I think it is interesting as a concept. A project I am advising has been
> > using DPDK very effectively to get rid of the huge path and locking
> delays
> > in the current Linux network stack. XDP2 could be supported in a ring3
> > (user) address space, achieving a similar result.
>

HI David,

The idea is you could write the code in XDP2 and it would be compiled to
DPDK or eBPF and the compiler would handle the optimizations.


> >
> >
> >
> > But I don't think XDP2 is going that direction - so it may be stuckinto
> > the mess of kernel space networking. Adding eBPF only has made this more
> of
> > a mess, by the way (and adding a new "compiler" that needs to be veriried
> > as safe for the kernel).


Think of XDP2 as the generalization of XDP to go beyond just the kernel.
The idea is that the user writes their datapath code once and they compile
it to run in whatever targets they have-- DPDK, P4, other programmable
hardware, and yes XDP/eBPF. It's really not limited to kernel networking.

As for the name XDP2, when we created XDP, eXpress DataPath, my vision was
that it would be implementation agnostic. eBPF was the first instantiation
for practicality, but now ten years later I think we can realize the
initial vision.

Tom



>
> > I will be watching how this evolves.
> >
> >
> >
> > David
> >
> >
> >
> > On Tuesday, September 9, 2025 06:32, "Frantisek Borsik" <
> > frantisek.borsik@gmail.com> said:
> >
> > > Hello to all,
> > >
> > > Looks interesting:
> > >
> >
> https://medium.com/@tom_84912/xdp2-this-changes-everything-at-least-for-ai-ml-infrastructure-850c1ba82771
> > >
> > >
> > > 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
> > > _______________________________________________
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> > >
> >
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