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Date:	Wed, 29 Nov 2006 17:35:59 -0800 (PST)
From:	David Miller <>
Subject: Re: [NET_SCHED 03/06]: Fix endless loops caused by inaccurate qlen
 counters (part 1)

From: Patrick McHardy <>
Date: Mon, 20 Nov 2006 14:08:41 +0100 (MET)

> [NET_SCHED]: Fix endless loops caused by inaccurate qlen counters (part 1)
> There are multiple problems related to qlen adjustment that can lead
> to an upper qdisc getting out of sync with the real number of packets
> queued, leading to endless dequeueing attempts by the upper layer code.
> All qdiscs must maintain an accurate q.qlen counter. There are basically
> two groups of operations affecting the qlen: operations that propagate
> down the tree (enqueue, dequeue, requeue, drop, reset) beginning at the
> root qdisc and operations only affecting a subtree or single qdisc
> (change, graft, delete class). Since qlen changes during operations from
> the second group don't propagate to ancestor qdiscs, their qlen values
> become desynchronized.
> This patch adds a function to propagate qlen changes up the qdisc tree,
> optionally calling a callback function to perform qdisc-internal
> maintenance when the child qdisc becomes empty. The follow-up patches
> will convert all qdiscs to use this function where necessary.
> Noticed by Timo Steinbach <>.
> Signed-off-by: Patrick McHardy <>

Applied to net-2.6.20, thanks a lot.
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