netdev - Re: can SFQ and perturb break paquet ordering ?

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Date:	Wed, 10 Mar 2010 13:30:10 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Julien Vehent <julien@...uxwall.info>
CC:	netdev@...r.kernel.org
Subject: Re: can SFQ and perturb break paquet ordering ?

Julien Vehent wrote:
> 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 ?

That's correct.
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