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Date:   Fri, 21 Oct 2016 04:36:57 -0700
From:   Eric Dumazet <>
To:     Jiri Kosina <>
Cc:     Jamal Hadi Salim <>, Phil Sutter <>,
        Cong Wang <>,
        Daniel Borkmann <>,
        "David S. Miller" <>,,
Subject: Re: [PATCH] net: sched: make default fifo qdiscs appear in the dump

On Fri, 2016-10-21 at 10:45 +0200, Jiri Kosina wrote:
> The original reason [1] for having hidden qdiscs (potential scalability 
> issues in qdisc_match_from_root() with single linked list in case of large 
> amount of qdiscs) has been invalidated by 59cc1f61f0 ("net: sched: convert 
> qdisc linked list to hashtable").
> This allows us for bringing more clarity and determinism into the dump by 
> making default pfifo qdiscs visible.
> [1]
> Signed-off-by: Jiri Kosina <>
> ---

Some of us are dealing with huge HTB hierarchies, so adding default fifo
in the dump will add more data pumped from the kernel.

BwE [1] for instance dumps qdisc/classes every 5 seconds.

I guess we'll need to not pull this patch in our kernels.

This reminds me of an HTB patch to avoid dumping rate estimates for HTB.

I will send it today.

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