Subject: Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average
From: Johannes Berg <johannes@sipsolutions.net>
To: Bruno Randolf <br1@einfach.org>
Cc: Jouni Malinen <j@w1.fi>, linville@tuxdriver.com, randy.dunlap@oracle.com,
        peterz@infradead.org, blp@cs.stanford.edu,
        linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
        Lars_Ericsson@telia.com, stefanr@s5r6.in-berlin.de,
        kosaki.motohiro@jp.fujitsu.com, akpm@linux-foundation.org,
        kevin.granade@gmail.com
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Date: Wed, 17 Nov 2010 08:16:35 -0800
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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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