netdev - Re: [PATCH iproute2] Re: HTB accuracy for high speed

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Message-ID: <4A252714.2020008@trash.net>
Date:	Tue, 02 Jun 2009 15:20:20 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	Antonio Almeida <vexwek@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, davem@...emloft.net, devik@....cz,
	Eric Dumazet <dada1@...mosbay.com>,
	Vladimir Ivashchenko <hazard@...ncoudi.com>
Subject: Re: [PATCH iproute2] Re: HTB accuracy for high speed

Jarek Poplawski wrote:
> On Tue, Jun 02, 2009 at 02:45:34PM +0200, Patrick McHardy wrote:
>> I didn't follow the full discussion, so I'm not sure which kind of
>> arithmetic error you're attempting to cure. For the HFSC scaling
>> factors, please just keep in mind that its also supposed to be
>> very accurate at low bandwidths.
> 
> It's all here:
> 
> http://permalink.gmane.org/gmane.linux.network/129301

I've read through the mails where you suggested to change the scaling
factors. I wasn't able to find the reasoning (IOW: where does it
overflow or loose precision in which case) though.

> Of course, I'd appreciate any suggestions.

The HFSC shifts would indeed need adjustments if the US<->NS conversion
factor were to change.

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