netdev - Re: [PATCH v2 2/2] [iproute2/tc] hfsc: add link layer overhead adaption

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Date:	Tue, 24 Jun 2008 22:58:50 +0300
From:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
To:	lists@...yfurniss.entadsl.com
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <shemminger@...l.org>
Subject: Re: [PATCH v2 2/2] [iproute2/tc] hfsc: add link layer overhead
	adaption

Quoting Andy Furniss <lists@...yfurniss.entadsl.com>:

> Jussi Kivilinna wrote:
>> Patch adds 'mpu', 'mtu', 'overhead' and 'linklayer' options to hfsc. These
>> options are used to create size table for sch_hfsc. Size table is only used
>> and passed to kernel if these options are used.
>
>> +	unsigned short overhead = 0, mpu = 0;
>
> overhead may need to be negative because skb->len on eth is payload + 14
>
> Andy.

Ok, I made size tables use signed short for overhead instead. But this  
makes me think should htb/cfq/tfb be changed to support negative  
overhead too? Rate table they use have unsigned overhead.

  - Jussi


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