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

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Message-ID: <412e6f7f0911040330uc5ebbcekfef57854fce501f@mail.gmail.com>
Date:	Wed, 4 Nov 2009 19:30:05 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Martin Devera <martin.devera@....cz>
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

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?

> Also it didn't played well with prio settings (class
> stalls).

Was it the cause?

> Bacause we don't charge "rate" now, some amount of burst can accumulate
> in each interior class and decrease fairness at the same prio level a bit.
> However from measurments I did, these bursts of unfairness are
> hidded by regular "bursting" of rate and ceil token buckets.
>

One case for unfairness.



-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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