From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp86.iad3a.emailsrvr.com (smtp86.iad3a.emailsrvr.com [173.203.187.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id D85173CB41 for ; Wed, 21 Nov 2018 10:28:55 -0500 (EST) Received: from smtp27.relay.iad3a.emailsrvr.com (localhost [127.0.0.1]) by smtp27.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id A4F2C23A0B; Wed, 21 Nov 2018 10:28:55 -0500 (EST) X-SMTPDoctor-Processed: csmtpprox beta Received: from smtp27.relay.iad3a.emailsrvr.com (localhost [127.0.0.1]) by smtp27.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id 99EAE24B4F; Wed, 21 Nov 2018 10:28:55 -0500 (EST) Received: from app8.wa-webapps.iad3a (relay-webapps.rsapps.net [172.27.255.140]) by smtp27.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id 7ED1923A0B; Wed, 21 Nov 2018 10:28:55 -0500 (EST) X-Sender-Id: MAILER-DAEMON Received: from app8.wa-webapps.iad3a (relay-webapps.rsapps.net [172.27.255.140]) by 0.0.0.0:25 (trex/5.7.12); Wed, 21 Nov 2018 10:28:55 -0500 Received: from deepplum.com (localhost.localdomain [127.0.0.1]) by app8.wa-webapps.iad3a (Postfix) with ESMTP id 6D73D60C3A; Wed, 21 Nov 2018 10:28:55 -0500 (EST) Received: by apps.rackspace.com (Authenticated sender: dpreed@deepplum.com, from: dpreed@deepplum.com) with HTTP; Wed, 21 Nov 2018 10:28:55 -0500 (EST) Date: Wed, 21 Nov 2018 10:28:55 -0500 (EST) From: "David P. Reed" To: "David Lang" Cc: "Dave Taht" , "Rajkumar Manoharan" , "Make-Wifi-fast" , "linux-wireless" , "ath10k" , "Ben Greear" , "Felix Fietkau" MIME-Version: 1.0 Content-Type: text/plain;charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Message-ID: <1542814135.446217011@apps.rackspace.com> X-Mailer: mobile/6.0.2 Subject: Re: [Make-wifi-fast] [PATCH v3 3/6] mac80211: Add airtimeaccounting and scheduling to TXQs X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 15:28:55 -0000 Really? Tires are Bluetooth? I don't think mine are, but now I want to figu= re out how that works. 1600Chips/sec is 600 microseconds per chip. They spi= n at up to, say, radial rates that are a 100 revs/sec and thus take maybe 1= 0 msec. to travel 30 cm. How much warble in a chip frequency is there? Ok, maybe they only need to work when the car is stopped. I would design a tire pressure system that sends, maybe, 10 bits per second= , at most. Or calibrate the sensor to produce 1 bit, and use the car metal = frame to carry the signal to the computer as a single bit. A very slowly va= rying sensor can be sensed without needing a battery, by using some passive= , tuned circuit. Bluetooth is way overkill, but cheap. I doubt it works well in the applicat= ion, though. -----Original From: "David Lang" Sent: Mon, Nov 19, 2018 at 9:12 pm To: "Dave Taht" Cc: "Dave Taht" , "Rajkumar Manoharan" , "Make-Wifi-fast" , "linux= -wireless" , "ath10k" , "Ben Greear" , "Felix Fietkau" Subject: Re: [Make-wifi-fast] [PATCH v3 3/6] mac80211: Add airtimeaccountin= g and scheduling to TXQs On Mon, 19 Nov 2018, Dave Taht wrote: >> I'm not sure if this was a fluke or not, but at Starbucks recently I sat= outside, >> right next to their window, and could not scan their AP at all. Previou= sly, I sat >> inside, 3 feet away through the glass, and got great signal. I wonder w= hat that was >> all about! Maybe special tinting that blocks RF? Or just dumb luck of = some sort. > > Ya know, I could definitely see a market for a material like that! I'd > like it for my car, so bluetooth wouldn't escape. That would break your tire pressure sensors (each car is rolling around=20 broadcasting 4 unique bluetooth IDs, not hard to track) David Lang _______________________________________________ Make-wifi-fast mailing list Make-wifi-fast@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/make-wifi-fast