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From: "Maciej Żenczykowski" <zenczykowski@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH] net: pfifo_fast - use ffs(x)-1 instead of array lookup
Date: Tue, 13 Mar 2012 00:23:27 -0700	[thread overview]
Message-ID: <CAHo-OoyWH9v+D7yJp3sAKnmUEp_DiTeDhmgPme2dGoqWGa2qjg@mail.gmail.com> (raw)
In-Reply-To: <CAHo-Ooyi_NOZeT978EjUaPSYBMco9FmQh8uNpCLr-6owfYyMTQ@mail.gmail.com>

I was actually leaning towards going with ffs()-1, since

it's excellent on x86-64
good on x86_cmov
decent on x86
good on armv5+

and I'm guessing it'll be good or better on any modern platform

  reply	other threads:[~2012-03-13  7:23 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-13  5:12 [PATCH] net: pfifo_fast - use ffs(x)-1 instead of array lookup Maciej Żenczykowski
2012-03-13  5:13 ` Maciej Żenczykowski
2012-03-13  5:54 ` David Miller
2012-03-13  7:21   ` Maciej Żenczykowski
2012-03-13  7:23     ` Maciej Żenczykowski [this message]
2012-03-13  7:25       ` David Miller
2012-03-13  7:25     ` David Miller
2012-03-13 11:04 ` David Laight
2012-03-13 16:55   ` David Laight
2012-03-13 17:34     ` Eric Dumazet
2012-03-13 20:37     ` Maciej Żenczykowski

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