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

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Message-Id: <20120810.165405.284352377586092244.davem@davemloft.net>
Date:	Fri, 10 Aug 2012 16:54:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, lp2s1h@...il.com
Subject: Re: [PATCH] codel: refine one condition to avoid a nul rec_inv_sqrt

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 10 Aug 2012 17:16:11 +0200

> 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 for catching this, I've corrected it now.
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