linux-kernel - Re: [PATCH] sched: fix virtual-start-time update in QFQ

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Message-Id: <20120919.162506.1493337375457097539.davem@davemloft.net>
Date:	Wed, 19 Sep 2012 16:25:06 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	paolo.valente@...more.it
Cc:	shemminger@...tta.com, jhs@...atatu.com, fchecconi@...il.com,
	rizzo@....unipi.it, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: fix virtual-start-time update in QFQ

From: Paolo Valente <paolo.valente@...more.it>
Date: Sat, 15 Sep 2012 12:41:35 +0200

> If the old timestamps of a class, say cl, are stale when the class
> becomes active, then QFQ may assign to cl a much higher start time
> than the maximum value allowed. This may happen when QFQ assigns to
> the start time of cl the finish time of a group whose classes are
> characterized by a higher value of the ratio
> max_class_pkt/weight_of_the_class with respect to that of
> cl. Inserting a class with a too high start time into the bucket list
> corrupts the data structure and may eventually lead to crashes.
> This patch limits the maximum start time assigned to a class.
> 
> Signed-off-by: Paolo Valente <paolo.valente@...more.it>

Applied and queued up for -stable, thanks.

Please use "pkt_sched" instead of just plain "sched" in the prefixes
of your subject lines for packet scheduler changes so such changes
can be distinguished from process scheduler changes.

I fixed it up for you this time.

Thanks.
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