Messages in this thread | | | Date | Wed, 17 Nov 2010 18:11:18 -0500 | Subject | Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average | From | Bob Copeland <> |
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On Wed, Nov 17, 2010 at 11:16 AM, Johannes Berg <johannes@sipsolutions.net> wrote: > On Wed, 2010-11-17 at 17:28 +0900, Bruno Randolf wrote: >> 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.
I assume the number of samples (weight) is the more important tunable. One option is you can require factor to be a power of two that is much larger than weight, then at least you can store factor/weight precomputed and multiply by it instead of doing a divide in ewma_add. Then ewma_get can also just be a shift as well.
-- Bob Copeland %% www.bobcopeland.com
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