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From: Andy Furniss <andy.furniss@dsl.pipex.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] userlevel should not need to know about HZ?
Date: Sat, 25 Feb 2006 11:53:06 +0000	[thread overview]
Message-ID: <44004522.8030100@dsl.pipex.com> (raw)
In-Reply-To: <20060223202145.GL3411@mandriva.com>

Andreas Hasenack wrote:
> Em Qui 23 Fev 2006 19:47, Andreas Klauer escreveu:
> 
>>>So, how do we reliably calculate the minimum value for
>>>buffer/burst/maxburts?
>>
>>Trial & Error, not that I ever had much luck with TBF though...
> 
> 
> From my experiments, the minimum seems to be either MTU plus a few bytes or 
> the result of rate/HZ, whichever is higher.

Both the buffers need to be at least MTU and if you shape on eth MTU+14.

You should set the limit buffer to the length of queue you want - 
1*MTU(+14) is pretty useless for a limit but OK for burst.

I am not sure about tbf and Hz if it's like htb you need to set burst 
big enough so its size * HZ can fill the link.

Andy.
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      parent reply	other threads:[~2006-02-25 11:53 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-02-23 20:21 [LARTC] userlevel should not need to know about HZ? Andreas Hasenack
2006-02-23 22:47 ` Andreas Klauer
2006-02-23 23:45 ` Andreas Hasenack
2006-02-25 11:53 ` Andy Furniss [this message]

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