netdev - Re: [PATCH net-next] tcp: add tcpi_segs_in and tcpi_segs_out to tcp

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Date:	Wed, 20 May 2015 17:06:37 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Marcelo Ricardo Leitner <mleitner@...hat.com>
CC:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Yuchung Cheng <ycheng@...gle.com>,
	Matt Mathis <mattmathis@...gle.com>,
	Craig Gallek <cgallek@...gle.com>, Martin Lau <kafai@...com>,
	Chris Rapier <rapier@....edu>
Subject: Re: [PATCH net-next] tcp: add tcpi_segs_in and tcpi_segs_out to tcp_info

On 05/20/2015 04:35 PM, Eric Dumazet wrote:
> From: Marcelo Ricardo Leitner <mleitner@...hat.com>
>
> This patch tracks the total number of inbound and outbound segments on a
> TCP socket. One may use this number to have an idea on connection
> quality when compared against the retransmissions.
>
> RFC4898 named these : tcpEStatsPerfSegsIn and tcpEStatsPerfSegsOut
>
> These are a 32bit field each and can be fetched both from TCP_INFO
> getsockopt() if one has a handle on a TCP socket, or from inet_diag
> netlink facility (iproute2/ss patch will follow)

I suppose it is far-fetched, but is it a concern that at 100 Gbit/s and 
1500 byte MTU the 32 bit segment counter would wrap in something like 
500 seconds and change?

rick jones

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