netdev - Re: [PATCH] codel: refine one condition to avoid a nul rec_inv

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Message-ID: <1344611771.31104.2716.camel@edumazet-glaptop>
Date:	Fri, 10 Aug 2012 17:16:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, lp2s1h@...il.com
Subject: Re: [PATCH] codel: refine one condition to avoid a nul rec_inv_sqrt

On Mon, 2012-07-30 at 14:54 -0700, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 30 Jul 2012 08:52:21 +0200
> 
> > From: Eric Dumazet <edumazet@...gle.com>
> > 
> > One condition before codel_Newton_step() was not good if
> > we never left the dropping state for a flow. As a result
> > rec_inv_sqrt was 0, instead of the ~0 initial value.
> > 
> > codel control law was then set to a very aggressive mode, dropping
> > many packets before reaching 'target' and recovering from this problem.
> > 
> > To keep codel_vars_init() as efficient as possible, refine
> > the condition to make sure rec_inv_sqrt initial value is correct
> > 
> > Many thanks to Anton Mich for discovering the issue and suggesting
> > a fix.
> > 
> > Reported-by: Anton Mich <lp2s1h@...il.com>
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> 
> Applied and queued up for -stable.

Hi David, I think this patch got lost somehow ?

Thanks


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