netdev - Re: [PATCH 1/2] sch_netem: Remove classful functionality

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Date:	Tue, 4 Nov 2008 08:25:10 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] sch_netem: Remove classful functionality

On Tue, 4 Nov 2008 09:56:42 +0000
Jarek Poplawski <jarkao2@...il.com> wrote:

> On Mon, Nov 03, 2008 at 09:06:30AM -0800, Stephen Hemminger wrote:
> > On Mon, 03 Nov 2008 12:20:25 +0100
> > Patrick McHardy <kaber@...sh.net> wrote:
> > 
> > > Jarek Poplawski wrote:
> > > > On Sun, Nov 02, 2008 at 12:37:00AM -0700, David Miller wrote:
> > > >> From: Jarek Poplawski <jarkao2@...il.com>
> > > >> Date: Fri, 31 Oct 2008 13:20:10 +0000
> > > >>
> > > >> Jarek, I applied this patch and your second one to net-next-2.6
> > > >>
> > > >> But I did this only because I trust that you will address Stephen's
> > > >> feedback wrt. making existing netem functionality available in
> > > >> some way.
> > > >>
> > > >> Otherwise I'll have to revert these changes.
> > > > 
> > > > Hmm... I thought there was kind of RFC for this, and it looked like
> > > > Patrick's idea won 100% of votes, but I'm not good in counting...
> > > > 
> > > > http://marc.info/?l=linux-netdev&m=122469801712438&w=2
> > > > http://marc.info/?l=linux-netdev&m=122469674709761&w=2
> > > > 
> > > > Anyway, IMHO adding TBF etc. functionalities to tfifo doesn't make
> > > > much sense, and if they are really needed it's better to revert
> > > > these patches and chose one of the other ways of doing reorder
> > > > proposed in this earlier thread.
> > > 
> > > Whats wrong with simply using TBF as parent qdisc of netem?
> > 
> > It works but does something slightly different.
> > 
> >    netem inside TBF is like long delay network followed by choke on last hop
> >    TBF inside netem was like choke on uplink followed by long delay network.
> 
> David, this makes sense to me, so please revert these two patches.
> (Then, I think we're still at RFC stage.)
> 
> Thanks.
> Jarek P.

Keep Jarek's patch, I am working on dummynet compatiable rate control.
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