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From: David Miller <davem@davemloft.net>
To: shemminger@linux-foundation.org
Cc: w@1wt.eu, rkuhn@e18.physik.tu-muenchen.de, andi@firstfloor.org,
dada1@cosmosbay.com, jengelh@linux01.gwdg.de,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] tcp_cubic: use 32 bit math
Date: Wed, 07 Mar 2007 18:55:39 -0800 (PST) [thread overview]
Message-ID: <20070307.185539.48527371.davem@davemloft.net> (raw)
In-Reply-To: <20070307170731.2b4397e3@freekitty>
From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Wed, 7 Mar 2007 17:07:31 -0800
> The basic calculation has to be done in 32 bits to avoid
> doing 64 bit divide by 3. The value x is only 22bits max
> so only need full 64 bits only for x^2.
>
> Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Applied, thanks Stephen.
What about Willy Tarreau's supposedly even faster variant?
Or does this incorporate that set of improvements?
next prev parent reply other threads:[~2007-03-08 2:55 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-24 1:05 [RFC] div64_64 support Stephen Hemminger
2007-02-24 16:19 ` Sami Farin
2007-02-26 19:28 ` Stephen Hemminger
2007-02-26 19:39 ` David Miller
2007-02-26 20:09 ` Jan Engelhardt
2007-02-26 21:28 ` Stephen Hemminger
2007-02-27 1:20 ` H. Peter Anvin
2007-02-27 3:45 ` Segher Boessenkool
2007-02-26 22:31 ` Stephen Hemminger
2007-02-26 23:02 ` Jan Engelhardt
2007-02-26 23:44 ` Stephen Hemminger
2007-02-27 0:05 ` Jan Engelhardt
2007-02-27 0:07 ` Stephen Hemminger
2007-02-27 0:14 ` Jan Engelhardt
2007-02-27 6:21 ` Dan Williams
2007-03-03 2:31 ` Andi Kleen
2007-03-05 23:57 ` Stephen Hemminger
2007-03-06 0:25 ` David Miller
2007-03-06 13:36 ` Andi Kleen
2007-03-06 14:04 ` [RFC] div64_64 support II Andi Kleen
2007-03-06 17:43 ` Dagfinn Ilmari Mannsåker
2007-03-06 18:25 ` David Miller
2007-03-06 18:48 ` H. Peter Anvin
2007-03-06 13:34 ` [RFC] div64_64 support Andi Kleen
2007-03-06 14:19 ` Eric Dumazet
2007-03-06 14:45 ` Andi Kleen
2007-03-06 15:10 ` Roland Kuhn
2007-03-06 18:29 ` Stephen Hemminger
2007-03-06 19:48 ` Andi Kleen
2007-03-06 20:04 ` Stephen Hemminger
2007-03-06 21:53 ` Sami Farin
2007-03-06 22:24 ` Sami Farin
2007-03-07 0:00 ` Stephen Hemminger
2007-03-07 0:05 ` David Miller
2007-03-07 0:05 ` Sami Farin
2007-03-07 16:11 ` Chuck Ebbert
2007-03-07 18:32 ` Sami Farin
2007-03-08 18:23 ` asm volatile [Was: [RFC] div64_64 support] Sami Farin
2007-03-08 22:01 ` asm volatile David Miller
2007-03-06 21:58 ` [RFC] div64_64 support David Miller
2007-03-06 22:47 ` [PATCH] tcp_cubic: faster cube root Stephen Hemminger
2007-03-06 22:58 ` cube root benchmark code Stephen Hemminger
2007-03-07 6:08 ` Update to " Willy Tarreau
2007-03-08 1:07 ` [PATCH] tcp_cubic: use 32 bit math Stephen Hemminger
2007-03-08 2:55 ` David Miller [this message]
2007-03-08 3:10 ` Stephen Hemminger
2007-03-08 3:51 ` David Miller
2007-03-10 11:48 ` Willy Tarreau
2007-03-12 21:11 ` Stephen Hemminger
2007-03-13 20:50 ` Willy Tarreau
2007-03-21 18:54 ` Stephen Hemminger
2007-03-21 19:15 ` Willy Tarreau
2007-03-21 19:58 ` Stephen Hemminger
2007-03-21 20:15 ` [PATCH 1/2] div64_64 optimization Stephen Hemminger
2007-03-21 20:17 ` [PATCH 2/2] tcp: cubic optimization Stephen Hemminger
2007-03-22 19:11 ` David Miller
2007-03-22 19:11 ` [PATCH 1/2] div64_64 optimization David Miller
2007-03-08 4:16 ` [PATCH] tcp_cubic: use 32 bit math Willy Tarreau
2007-03-07 4:20 ` [PATCH] tcp_cubic: faster cube root David Miller
2007-03-07 12:12 ` Andi Kleen
2007-03-07 19:33 ` David Miller
2007-03-06 18:50 ` [RFC] div64_64 support H. Peter Anvin
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