netdev - Re: [NET_SCHED 11/11]: qdisc: avoid dequeue while throttled

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Message-ID: <4603E6AE.6000606@trash.net>
Date:	Fri, 23 Mar 2007 15:39:42 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	davem@...emloft.net
CC:	netdev@...r.kernel.org
Subject: Re: [NET_SCHED 11/11]: qdisc: avoid dequeue while throttled

Patrick McHardy wrote:
> [NET_SCHED]: qdisc: avoid dequeue while throttled

It just occured to me that this doesn't work properly with qdiscs
that have multiple classes since they all don't properly maintain
the TCQ_F_THROTTLED flag. They set it on dequeue when no active
class is willing to give out packets, but when enqueueing to a
non-active class (thereby activating it) it is still set even though
we don't know if that class could be dequeued.

So this updated patch unsets the TCQ_F_THROTTLED flag whenever we
activate a class. Additionally it removes the unsetting of
TCQ_F_THROTTLED on successful dequeue since we're now guaranteed
that it was not set before.

View attachment "11.diff" of type "text/x-diff" (4395 bytes)