netdev - Re: [PATCH] sch_htb.c consume the classes's tokens bellow the HTB_CAN

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Date:	Wed, 04 Nov 2009 12:51:38 +0100
From:	Martin Devera <martin.devera@....cz>
To:	Changli Gao <xiaosuo@...il.com>
CC:	Jarek Poplawski <jarkao2@...il.com>,
	Jamal Hadi Salim <hadi@...erus.ca>, netdev@...r.kernel.org
Subject: Re: [PATCH] sch_htb.c consume the classes's tokens bellow the 	HTB_CAN_SEND
 level

Changli Gao wrote:
> On Wed, Nov 4, 2009 at 6:58 PM, Martin Devera <martin.devera@....cz> wrote:
>> Hello,
>>
>> yes you are right. If I remember correctly, I tried to charge "rate"
>> tokens up to root in early versions (which makes some sense) but problem
>> is with many interior classes stuck at extreme mbuffer value, losing
>> responsivity.
> 
> It is strange. Would you like describe it more clearly?

oops, forget it, I mixed it with different problem I remember :-)
The idea is to charge classe's tokens when it sends.
It always must be under ceil thus when it sends we can charge
ctokens (it must have some in order to be in CAN_SEND).
If it borrows, we don't charge it because doesn't send from
its own rate but rather from parent's rate. Thus charge
only parent. Because parent gave it rate as gift, free of charge,
it has it in addition to its own rate.

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