netdev - Re: TCP and reordering

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Message-ID: <1354100552.14302.78.camel@edumazet-glaptop>
Date:	Wed, 28 Nov 2012 03:02:32 -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 09:08 +0000, David Woodhouse wrote:
> On Wed, 2012-11-28 at 00:22 -0800, Vijay Subramanian wrote:
> > 
> > I don't believe reordering is tracked on the receiver side but on the
> > sender, there are SNMB_MIB items.
> > They can be tracked and can be viewed using nstat/netstat
> > 
> > # nstat -az | grep -i reorder
> > TcpExtTCPFACKReorder            0                  0.0
> > TcpExtTCPSACKReorder            0                  0.0
> > TcpExtTCPRenoReorder            0                  0.0
> > TcpExtTCPTSReorder              0                  0.0
> 
> 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.



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