netdev - Re: TCP and reordering

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Message-ID: <1354105619.14302.89.camel@edumazet-glaptop>
Date:	Wed, 28 Nov 2012 04:26:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Vijay Subramanian <subramanian.vijay@...il.com>,
	David Miller <davem@...emloft.net>, saku@...i.fi,
	rick.jones2@...com, netdev@...r.kernel.org
Subject: Re: TCP and reordering

On Wed, 2012-11-28 at 11:49 +0000, David Woodhouse wrote:
> On Wed, 2012-11-28 at 03:02 -0800, Eric Dumazet wrote:
> > > Thanks. For me after a 64MiB download, I have an increase of one FACK,
> > > one SACK and one TS reorder. So my connection probably does even less
> > > reordering than I thought, and thus isn't particularly relevant to this
> > > conversation. I'll shut up now and go back to playing with ATM.
> > 
> > But you are the receiver. A receiver should not increase these counters.
> 
> I checked it on the sending side.
> 

If you want to play with reordering effects on your bi-ADSL line,
you could install an "netem delay 3ms" on ingress side of one of the
link.


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