netdev - Re: TCP and reordering

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Date:	Wed, 28 Nov 2012 09:08:23 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Vijay Subramanian <subramanian.vijay@...il.com>
Cc:	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 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.

-- 
dwmw2


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