linux-kernel - Re: [PATCH] net: sched: make default fifo qdiscs appear in the dump

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Message-ID: <1477055663.7065.67.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 21 Oct 2016 06:14:23 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, Phil Sutter <phil@....cc>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: sched: make default fifo qdiscs appear in the dump

On Fri, 2016-10-21 at 14:56 +0200, Jiri Kosina wrote:
> On Fri, 21 Oct 2016, Eric Dumazet wrote:
> 
> > 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.
> 
> Okay, so I probably misunderstood you here:
> 
> 	https://marc.info/?l=linux-kernel&m=146073234818214&w=2
> 
> as I thought that as long as we move towards the hashtable, you wouldn't 
> have any issues with this.
> 
> I'd really like to unhide the default qdiscs, it makes little sense to be 
> inconsistent in this way.
> 
> Random shot into darkness -- how about making this a 
> CONFIG/sysctl-selectable?

Oh sorry for the confusion, I believe your patch is fine.

We could add an netlink attribute later for the users that really do not
want default fifo being dumped, but there is no hurry.

Acked-by: Eric Dumazet <edumazet@...gle.com>