Scaling BFD support

[Douglas Fischer]

Hello all!

Just passing here to see if any moves on this BFD Scaling occurred.

This week some friends that are involved in the operation of a really big
IXP told me that they were having problems with some "funny" participants
of its IXP that adjusted their BGP Timer to numbers like 5/15.
On an environment with thousands of peers, I'm sure you can imagine the CPU
impact of that.

Now you are probably asking:
What that has to do with Scale the BFD capacities on BIRD?

Well...
Those 'j'enius are probably adjusting the timers to have some kind of
control of some communication issue occurs between his router and the RS.
They just "forget" that on that level of reduction, it compromises the
processing capacity of the RS.

If BFD engine could support session for every participant at IXP, or at
least for those that wants that kind of resource.
Then would be reasonable to lock the timers of BGP Session in 60/180.


Em sex., 1 de abr. de 2022 às 13:41, Ondrej Zajicek <santiago at crfreenet.org>
escreveu:

> On Fri, Apr 01, 2022 at 08:44:50AM -0300, Douglas Fischer wrote:
> > The question raised by colleague Irene reminded me of a topic that may or
> > may not be the focus of BIRD's development.
> >
> > I imagine that the biggest supporters of SMP/Multi-Core/Thread-Safe
> > evolution on BIRD are Operators of Route-Servers of large IXPs, and
> > operators of large-scale Route-Reflectors.
> >
> > Although BFD has its greatest use in the transport network and Underlay,
> it
> > is increasingly common to see the use of BFD in BGP Internet.
> >
> > I'm personally overly excited about what BIRD version 3 is demonstrating
> in
> > terms of vertical scalability.
> >
> > But I keep imagining that, even having scalability in the BGP engine, it
> is
> > almost prohibitive to use BFD in a scenario with a thousand BGP Peers.
> >
> > Is there any view from the IBRD development team for this matter?
> > Or even... Is there any open project focused on BFD that can address
> this?
>
> Hmm, that is a good point. It would make sense to have multiple BFD
> threads, but i think that it is more a question of improving I/O loop
> performance in BIRD, as thousand peers with 100ms period is about 10 kpps
> UDP rate, which should be manageable even from a single thread. We should
> make some effort to do some benchmarking for BFD.
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."
>


-- 
Douglas Fernando Fischer
Engº de Controle e Automação
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