Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754923Ab0KXQaO (ORCPT ); Wed, 24 Nov 2010 11:30:14 -0500 Received: from charlotte.tuxdriver.com ([70.61.120.58]:52947 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754547Ab0KXQaM (ORCPT ); Wed, 24 Nov 2010 11:30:12 -0500 Date: Wed, 24 Nov 2010 11:24:36 -0500 From: "John W. Linville" To: Bruno Randolf Cc: randy.dunlap@oracle.com, br1@thinktube.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 Subject: Re: [PATCH v8 3/3] nl80211/mac80211: Report signal average Message-ID: <20101124162435.GB7435@tuxdriver.com> References: <20101116015837.21081.79264.stgit@localhost6.localdomain6> <20101116015848.21081.60180.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20101116015848.21081.60180.stgit@localhost6.localdomain6> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2420 Lines: 56 On Tue, Nov 16, 2010 at 10:58:48AM +0900, Bruno Randolf wrote: > Extend nl80211 to report an exponential weighted moving average (EWMA) of the > signal value. Since the signal value usually fluctuates between different > packets, an average can be more useful than the value of the last packet. > > This uses the recently added generic EWMA library function. > > Signed-off-by: Bruno Randolf > --- > include/linux/nl80211.h | 2 ++ > include/net/cfg80211.h | 4 ++++ > net/mac80211/Kconfig | 1 + > net/mac80211/cfg.c | 3 ++- > net/mac80211/rx.c | 1 + > net/mac80211/sta_info.c | 2 ++ > net/mac80211/sta_info.h | 3 +++ > net/wireless/nl80211.c | 3 +++ > 8 files changed, 18 insertions(+), 1 deletions(-) > > diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h > index fb877b5..0ceb552 100644 > --- a/include/linux/nl80211.h > +++ b/include/linux/nl80211.h > @@ -1132,6 +1132,7 @@ enum nl80211_rate_info { > * @__NL80211_STA_INFO_AFTER_LAST: internal > * @NL80211_STA_INFO_MAX: highest possible station info attribute > * @NL80211_STA_INFO_SIGNAL: signal strength of last received PPDU (u8, dBm) > + * @NL80211_STA_INFO_SIGNAL_AVG: signal strength average (u8, dBm) > * @NL80211_STA_INFO_TX_BITRATE: current unicast tx rate, nested attribute > * containing info as possible, see &enum nl80211_sta_info_txrate. > * @NL80211_STA_INFO_RX_PACKETS: total received packet (u32, from this station) > @@ -1149,6 +1150,7 @@ enum nl80211_sta_info { > NL80211_STA_INFO_PLID, > NL80211_STA_INFO_PLINK_STATE, > NL80211_STA_INFO_SIGNAL, > + NL80211_STA_INFO_SIGNAL_AVG, > NL80211_STA_INFO_TX_BITRATE, > NL80211_STA_INFO_RX_PACKETS, > NL80211_STA_INFO_TX_PACKETS, It's been pointed-out that this breaks kernel->userland ABI. That could be fixed rather easily, but due to the performance concerns I'm going to just revert this one for now. Please correct the ABI issue when submitting a new version that addresses the performance concerns raised by Jouni. John -- John W. Linville Someday the world will need a hero, and you linville@tuxdriver.com might be all we have. Be ready. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/