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Date:	Thu, 21 May 2009 10:28:05 +0200
From:	Jarek Poplawski <>
To:	Vladimir Ivashchenko <>
Cc:	Eric Dumazet <>,,,,,
	Antonio Almeida <>,
	Corey Hickey <>
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:
> >
> 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
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