linux-kernel - Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average

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Date:	Wed, 17 Nov 2010 08:16:35 -0800
From:	Johannes Berg <johannes@...solutions.net>
To:	Bruno Randolf <br1@...fach.org>
Cc:	Jouni Malinen <j@...fi>, linville@...driver.com,
	randy.dunlap@...cle.com, peterz@...radead.org, blp@...stanford.edu,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lars_Ericsson@...ia.com, stefanr@...6.in-berlin.de,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	kevin.granade@...il.com
Subject: Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average

On Wed, 2010-11-17 at 17:28 +0900, Bruno Randolf wrote:

> > Or am I missing something here and we have a compiler that is actually
> > able to take care of this kind of optimizations by itself in the current
> > ewma library design? Or is the unsigned long division with the expected
> > weight values going to be fast enough to not justify caring about it
> > even on any of the embedded boards anyway?
> 
> I understand that this could be more efficient, but if it matters or not - 
> honestly, I don't know. Can a more knowledgeable person than me comment on 
> this?

Yes, it does matter -- think of an embedded MIPS board running at 500MHz
and trying to push 11n speeds.

johannes

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