[Cake] [NetDev-People] 0x19: Talk, mq-cake: Scaling software rate limiting across CPU cores

[Sebastian Moeller]

That sounds most excellent...

This also means that now we need cheap router hardware with > 2 NIC queues and > 2 CPUs ;) (with ingress and egress shaping the current state is that 2 CPUs can be utilised). I wonder, does this work for IFBs as well or only for real hardware NIC queues?

Regards
	Sebastian


> On 10. Feb 2025, at 10:30, Toke Høiland-Jørgensen via Cake <cake at lists.bufferbloat.net> wrote:
> 
> FYI :)
> 
> 
> From: Jamal Hadi Salim via people <people at netdevconf.info>
> Subject: [NetDev-People] 0x19: Talk, mq-cake: Scaling software rate limiting across CPU cores
> Date: 9. February 2025 at 14:37:41 CET
> To: people <people at netdevconf.info>
> Cc: Kimberley Jeffries <kimberleyjeffries at gmail.com>, Lael Santos <lael.santos at expertisesolutions.com.br>, program-committee at netdevconf.info, Bruno Banelli <bruno.banelli at sartura.hr>, j.koeppeler at tu-berlin.de, stefan.schmid at tu-berlin.de, Jamal Hadi Salim <jhs at mojatatu.com>
> 
> 
> Qdiscs rely on global lock to sync state across CPUs and therefore
> dont scale in presence of many cores (or in presence of very high
> bandwidth).
> Jonas Köppeler, Toke Høiland-Jørgensen, and Stefan Schmid implemented
> a multi-queue variant of sch_cake that can scale its rate limiting
> across hardware queues (and thus CPU cores) by sharing a bit of state
> on top of the mq qdisc.
> 
> In this talk, they will present the implementation, performance
> evaluation, as well as discuss their proposal for an API that will
> make this work upstreamable, and applicable to other qdiscs as well.
> 
> Details: https://netdevconf.info/0x19/16
> 
> cheers,
> jamal
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