From: David Miller <davem@davemloft.net>
To: xiaosuo@gmail.com
Cc: eric.dumazet@gmail.com, hagen@jauu.net, netdev@vger.kernel.org
Subject: Re: [PATCH net-next-2.6] filter: use reciprocal divide
Date: Fri, 19 Nov 2010 10:07:26 -0800 (PST) [thread overview]
Message-ID: <20101119.100726.48508760.davem@davemloft.net> (raw)
In-Reply-To: <AANLkTi=qR==8g2Z_GeAOsczVmUS3yj1PnsOfoU7zbudG@mail.gmail.com>
From: Changli Gao <xiaosuo@gmail.com>
Date: Fri, 19 Nov 2010 16:18:05 +0800
> On Fri, Nov 19, 2010 at 4:04 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
>> At compile time, we can replace the DIV_K instruction (divide by a
>> constant value) by a reciprocal divide.
>>
>> At exec time, the expensive divide is replaced by a multiply, a less
>> expensive operation on most processors.
>>
>> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
>
> Acked-by: Changli Gao <xiaosuo@gmail.com>
Applied.
next prev parent reply other threads:[~2010-11-19 18:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-19 2:04 [PATCH] net: reduce the lines of code Changli Gao
2010-11-19 6:35 ` Hagen Paul Pfeifer
2010-11-19 7:17 ` Changli Gao
2010-11-19 7:51 ` Eric Dumazet
2010-11-19 7:56 ` [PATCH net-next-2.6] filter: cleanup codes[] init Eric Dumazet
2010-11-19 8:04 ` [PATCH net-next-2.6] filter: use reciprocal divide Eric Dumazet
2010-11-19 8:18 ` Changli Gao
2010-11-19 18:07 ` David Miller [this message]
2010-11-19 8:38 ` [PATCH net-next-2.6] filter: cleanup codes[] init Changli Gao
2010-11-19 9:54 ` Eric Dumazet
2010-11-19 11:17 ` [PATCH net-next-2.6] filter: optimize sk_run_filter Eric Dumazet
2010-11-19 12:32 ` Changli Gao
2010-11-19 12:57 ` Changli Gao
2010-11-19 13:16 ` [PATCH net-next-2.6 v2] " Eric Dumazet
2010-11-19 14:13 ` Changli Gao
2010-11-19 17:52 ` David Miller
2010-11-19 14:17 ` Tetsuo Handa
2010-11-19 14:35 ` Eric Dumazet
2010-11-19 16:21 ` [PATCH net-next-2.6] " David Miller
2010-11-19 16:55 ` Eric Dumazet
2010-11-19 17:05 ` David Miller
2010-11-19 17:15 ` Stephen Hemminger
2010-11-19 17:21 ` David Miller
2010-11-19 17:16 ` Eric Dumazet
2010-11-19 17:25 ` David Miller
2010-11-19 12:21 ` [PATCH net-next-2.6] filter: cleanup codes[] init Changli Gao
2010-11-19 18:07 ` David Miller
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