netdev - Re: HTB accuracy for high speed

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Message-ID: <20090518104559.GA11162@ff.dom.local>
Date:	Mon, 18 May 2009 10:45:59 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Antonio Almeida <vexwek@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org,
	kaber@...sh.net, davem@...emloft.net, devik@....cz,
	Vladimir Ivashchenko <hazard@...ncoudi.com>
Subject: Re: HTB accuracy for high speed

On Mon, May 18, 2009 at 11:01:21AM +0100, Antonio Almeida wrote:
> Hi!
> 
> cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> returns "jiffies"
> 
> With HFSC the accuracy is good. Also with packets of 800 bytes I got
> these values:
> received            configured         error
> 904596519	900000000		0,51
> 804293658	800000000		0,54
> 703662853	700000000		0,52
> 603354059	600000000		0,56
> 502805411	500000000		0,56
> 402527055	400000000		0,63
> 301484904	300000000		0,49
> 201074301	200000000		0,54
> 100546656	100000000		0,55
> 

Looks great! But, since HFSC uses rates directly (without rate tables)
seems to be logical. So, it looks like the best choice for handling
>100Mbit configs now.

Thanks,
Jarek P.
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