netdev - Re: Per TCP session statistics

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Message-ID: <CAEnQRZBprHhWU442U5Jmq=SPGKaUDD4kPV_M43eKuTakQotctg@mail.gmail.com>
Date:	Tue, 20 Mar 2012 15:32:27 +0200
From:	Daniel Baluta <daniel.baluta@...il.com>
To:	James Courtier-Dutton <james.dutton@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Per TCP session statistics

On Tue, Mar 20, 2012 at 3:26 PM, James Courtier-Dutton
<james.dutton@...il.com> wrote:
> Hi,
>
> Is there a way to gather stats for each TCP session?
> The stats I am looking for are periodic sampling of the following metrics:
>
> Statistics         Def nition
> Cwin                Current congestion window
> Rwin                Current receive window
> BytesInFlight     # of bytes sent but not ACKed
> BytesInSndBuf   # of bytes written but not ACKed
> SmoothedRTT    Smoothed RTT computed by TCP
> BytesWritten    Cumulative # of bytes written by app
> BytesSent       Cumulative # of bytes sent
> PktsRetrans     Cumulative # of pkts retransmitted
> RwinLimitTime   Cumulative time that a connection is limited by receive window
> CwinLimitTime   Cumulative time that a connection is limited by
> congestion window
>
> So, for example,
> 1) I could say that all TCP sessions being listened to by process ID
> 2002 will get stats written to a file per tcp session per 60 seconds.
> 2) Gather local statistics for all TCP sessions initiated by process "firefox".
>
> Does there already exit such a tool for Linux?

Have a look at ss ([1]).

thanks,
Daniel.

[1] http://linux.die.net/man/8/ss
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