netdev - Re: [PATCH] ipv4: add DiffServ priority based routing

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Date:	Fri, 12 Mar 2010 12:18:05 +0100
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	David Miller <davem@...emloft.net>
Cc:	philipp_subx@...fish-solutions.com,
	torsten.schmidt@...06.tu-chemnitz.de, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: add DiffServ priority based routing

David Miller <davem@...emloft.net> writes:

> Look, this doesn't work.  QoS handling and policy belongs in the
> egress point to the network, it's the only way to control this
> properly and prevent abuse.

First, QoS is important even within the network. Modern switches come
pre-configured with sane defaults which ensure that e.g. EF marked
packets get priority over non-EF-marked packets. Cisco, HP, and
Linksys-Cisco at least provide a decent out-of-the-box configuration.

This can obviously be abused, but the solution there is the same as in
network abuses: Either apply the LART or change the configuration of the
switches to be less trusting. We haven't, so far, had a customer where
the LART was necessary, much less had to reconfigure a switch.

So why not let Linux provide the same out-of-the-box experience as the
switches do? If the trust is abused Linux provides lots of tools to make
it less trusting or even to punish the abusers.

/Benny
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