linux-kernel - Re: [PATCH] tcp_cubic: faster cube root

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Message-Id: <20070306.202052.03980320.davem@davemloft.net>
Date:	Tue, 06 Mar 2007 20:20:52 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	rkuhn@....physik.tu-muenchen.de, andi@...stfloor.org,
	dada1@...mosbay.com, jengelh@...ux01.gwdg.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp_cubic: faster cube root

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Tue, 6 Mar 2007 14:47:06 -0800

> The Newton-Raphson method is quadratically convergent so
> only a small fixed number of steps are necessary.
> Therefore it is faster to unroll the loop. Since div64_64 is no longer
> inline it won't cause code explosion.
> 
> Also fixes a bug that can occur if x^2 was bigger than 32 bits.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

Applied, thanks Stephen.
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