netdev - TBF parameters: overhead and linklayer ?

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Message-ID: <7370d7aa62d806f62f2a22b4095dd0ec@localhost>
Date:	Mon, 15 Mar 2010 17:42:39 +0100
From:	Julien Vehent <julien@...uxwall.info>
To:	Netdev <netdev@...r.kernel.org>
Subject: TBF parameters: overhead and linklayer ?

Hello,

TC_TBF man page seem outdated (even in latest version of iproute2) and
doesn't explain what those two parameters do:

# tc qdisc add tbf help
Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu
BYTES[/BYTES] ]
        [ peakrate KBPS ] [ latency TIME ] [ overhead BYTES ] [ linklayer
TYPE ]

 - overhead ?
 - linklayer ?

Or did I miss something ?

Thanks,
Julien
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