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From: Jonathan Morton <chromatix99@gmail.com>
To: "Holland, Jake" <jholland@akamai.com>
Cc: "Linus Lüssing" <linus.luessing@c0d3.blue>,
	"bloat@lists.bufferbloat.net" <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Congestion control with FQ-Codel/Cake with Multicast?
Date: Sat, 25 May 2024 14:15:32 +0300	[thread overview]
Message-ID: <1DA90C88-5762-43C4-84FF-51F4623D82CE@gmail.com> (raw)
In-Reply-To: <A7CFFD21-1EF5-48A0-92AC-A62D9C589489@akamai.com>

> On 24 May, 2024, at 12:43 am, Holland, Jake via Bloat <bloat@lists.bufferbloat.net> wrote:
> 
> I agree with your conclusion that FQ systems would see different
> streams as separate queues and each one could be independently
> overloaded, which is among the reasons I don't think FQ can be
> viewed as a solution here (though as a mitigation for the damage
> I'd expect it's a good thing to have in place).

Cake has the facility to override the built-in flow and tin classification using custom filter rules.  Look in the tc-cake manpage under "OVERRIDING CLASSIFICATION".  This could be applicable to multicast traffic in two ways:

1: Assign all traffic with a multicast-range IP address to the Video tin.  Since Cake schedules by tin first, and only then by host and/or flow, this should successfully keep multicast traffic from obliterating best-effort and Voice tin traffic.

2: Assign all multicast traffic to a single flow ID (eg. zero), without reassigning the tin.  This will cause it all to be treated like a single flow, giving the FQ mechanisms something to bite on.

 - Jonathan Morton

  parent reply	other threads:[~2024-05-25 11:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-21 14:56 Linus Lüssing
2024-05-21 15:25 ` Linus Lüssing
2024-05-23 21:43 ` Holland, Jake
2024-05-23 23:15   ` Holland, Jake
2024-05-25 11:15   ` Jonathan Morton [this message]
2024-05-24 13:58 ` Toke Høiland-Jørgensen

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