From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [PATCH net-next] netem: add cell concept to simulate special
 MAC behavior
Date: Mon, 12 Dec 2011 09:18:58 -0800
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Cc: Hagen Paul Pfeifer <hagen@jauu.net>, netdev@vger.kernel.org,
	davem@davemloft.net, Florian Westphal <fw@strlen.de>
To: Eric Dumazet <eric.dumazet@gmail.com>
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On Sat, 10 Dec 2011 17:43:52 +0100
Eric Dumazet <eric.dumazet@gmail.com> wrote:

> >  struct tc_netem_rate {
> >  	__u32	rate;	/* byte/s */
> > +	__s32	packet_overhead;
> > +	__u32	cell_size;
> > +	__s32	cell_overhead;  
> 
> Adding fields in existing structure is convenient, but this means a
> previous tc binary wont work anymore.

In this case it is ok because there  has not been a release
using this structure yet.