netdev - Re: HTB accuracy for high speed

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Date:	Thu, 21 May 2009 10:28:05 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Vladimir Ivashchenko <hazard@...ncoudi.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org,
	kaber@...sh.net, davem@...emloft.net, devik@....cz,
	Antonio Almeida <vexwek@...il.com>,
	Corey Hickey <bugfood-ml@...ooh.org>
Subject: Re: HTB accuracy for high speed

On Thu, May 21, 2009 at 10:44:00AM +0300, Vladimir Ivashchenko wrote:
> > I don't know why more of esfq wasn't merged, anyway similar
> > functionality could be achieved in current kernels with sch_drr +
> > cls_flow, alas not enough documented. Here is some hint:
> > http://markmail.org/message/h24627xkrxyqxn4k
> 
> Can I balance only by destination IP using this approach? 
> Normal IP flow-based balancing is not good for me, I need 
> to ensure equality between destination hosts.

Yes, you need to use flow "dst" key, I guess. (tc filter add flow help)

Jarek P.

> > PS: I guess, you wasn't very consistent if your main problem was
> > exceeding or not reaching htb rate, and there is quite a difference.
> 
> Yes indeed :(

Generally, the most common reasons are:
- too short (or zero) tx queue length or/plus some disturbances in
  maintaining the flow - for not reaching the rate
- gso/tso or other non standard packets sizes - for exceeding the
  rate.
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