netdev - can SFQ and perturb break paquet ordering ?

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Message-ID: <ca4f1a12b3ba9c81f3276c091063613f@localhost>
Date:	Wed, 10 Mar 2010 13:22:50 +0100
From:	Julien Vehent <julien@...uxwall.info>
To:	<netdev@...r.kernel.org>
Subject: can SFQ and perturb break paquet ordering ?

Hi netdev folks,

I was digging into the sch_sfq code and I was wondering the following (I
assume it's nothing new, I'm just trying to get it right):

Let's consider one UDP connection that has two packets. Packet#1 goes to
bucket#1, then perturb modifies the hashing algorithms and thus Packet#2
goes to bucket#800.

If the round robin was positionned after bucket#1 but before bucket#800
when perturb occured, then Packet#2 will be sent before Packet#1. And since
UDP can't reordered, it will be processed before on the received end.

Am I getting this right or is there something in the code that I missed ?

Thanks for your help.

Julien Vehent
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