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

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Message-Id: <20090603.215314.96383042.davem@davemloft.net>
Date:	Wed, 03 Jun 2009 21:53:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	jarkao2@...il.com, vexwek@...il.com, shemminger@...tta.com,
	netdev@...r.kernel.org, devik@....cz, dada1@...mosbay.com,
	hazard@...ncoudi.com
Subject: Re: [PATCH iproute2] Re: HTB accuracy for high speed

From: Patrick McHardy <kaber@...sh.net>
Date: Wed, 03 Jun 2009 09:53:11 +0200

> Jarek Poplawski wrote:
>> On Wed, Jun 03, 2009 at 09:06:37AM +0200, Patrick McHardy wrote:
>>> Mid-term we really need to move to 64 bit values and ns resolution,
>>> otherwise this problem is just going to reappear as soon as someone
>>> tries 10gbit. Not sure what the best short term fix is, I feel a bit
>>> uneasy about changing the current factors given how close this brings
>>> us towards overflowing.
>> I completely agree it's on the verge of overflow, and actually would
>> overflow for some insanely low (for today's standards) rates. So I
>> treat it's as a temporary solution, until people start asking about
>> more than 1 or 2Gbit. And of course we will have to move to 64 bit
>> anyway. Or we can do it now...
> 
> That (now) would certainly be the best solution, but its a non-trivial
> task since all the ABIs use 32 bit values.

We could pass in a new attribute which provides the upper-32bits
of the value.  I'm not sure if that works in this case but it's
an idea.

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