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

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Date:	Tue, 24 Jun 2008 22:39:24 +0100
From:	Andy Furniss <lists@...yfurniss.entadsl.com>
To:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
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

Jussi Kivilinna wrote:
> 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.

Yea they should really, somehow - eventually :-) It was discussed here -

http://news.gmane.org/find-root.php?group=gmane.linux.network&article=90386

Andy.
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