netdev - Re: Deleting child qdisc doesn't reset parent to default qdisc?

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Message-ID: <alpine.LNX.2.00.1604141733250.27368@cbobk.fhfr.pm>
Date:	Thu, 14 Apr 2016 17:34:52 +0200 (CEST)
From:	Jiri Kosina <jikos@...nel.org>
To:	Phil Sutter <phil@....cc>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Deleting child qdisc doesn't reset parent to default qdisc?

On Thu, 14 Apr 2016, Phil Sutter wrote:

> OTOH some qdiscs (CBQ, DRR, DSMARK, HFSC, HTB, QFQ) assign the default
> one upon deletion instead of noop_qdisc, hence I would describe
> the situation using the words 'inconsistent' and 'accident' rather than
> 'expected'. :)

Exactly. I'd again like to stress the fact that this configuration works:

	jikos:~ # tc qdisc show
	qdisc tbf 10: dev eth0 root refcnt 2 rate 800Mbit burst 131000b lat 1.0ms 

and this (after performing add/delete operation) doesn't:

	jikos:~ # tc qdisc show
	qdisc tbf 10: dev eth0 root refcnt 2 rate 800Mbit burst 131000b lat 1.0ms 

It's hard to spot a difference (hint: there is none).

Thanks,

-- 
Jiri Kosina
SUSE Labs