From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH iproute2] htb: report overhead attribute
Date: Mon, 03 Jun 2013 08:56:02 -0700
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Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
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To: Rick Jones <rick.jones2@hp.com>
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On Mon, 2013-06-03 at 08:45 -0700, Rick Jones wrote:

> Is it (still) possible to have a negative overhead?
> 
> http://www.linksysinfo.org/index.php?threads/speedmod-with-tc-atm-qos-patch-for-adsl.31541/

overhead always has been unsigned in the kernel.

What you describe is a userland hack in tc command.

(or a bug)