From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jarek Poplawski <jarkao2@gmail.com>
Subject: Re: HTB accuracy for high speed
Date: Thu, 21 May 2009 10:28:05 +0200
Message-ID: <20090521082805.GB2892@ami.dom.local>
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Cc: Eric Dumazet <dada1@cosmosbay.com>, netdev@vger.kernel.org,
	kaber@trash.net, davem@davemloft.net, devik@cdi.cz,
	Antonio Almeida <vexwek@gmail.com>,
	Corey Hickey <bugfood-ml@fatooh.org>
To: Vladimir Ivashchenko <hazard@francoudi.com>
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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.