From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp87.iad3a.emailsrvr.com ([173.203.187.87]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gPURC-00024j-67 for ath10k@lists.infradead.org; Wed, 21 Nov 2018 15:29:11 +0000 Date: Wed, 21 Nov 2018 10:28:55 -0500 (EST) Subject: RE: Re: [Make-wifi-fast] [PATCH v3 3/6] mac80211: Add airtimeaccounting and scheduling to TXQs From: "David P. Reed" MIME-Version: 1.0 Message-ID: <1542814135.446217011@apps.rackspace.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: David Lang Cc: Rajkumar Manoharan , Make-Wifi-fast , linux-wireless , Dave Taht , ath10k , Ben Greear , Felix Fietkau Really? Tires are Bluetooth? I don't think mine are, but now I want to figure out how that works. 1600Chips/sec is 600 microseconds per chip. They spin at up to, say, radial rates that are a 100 revs/sec and thus take maybe 10 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 varying 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 application, 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 airtimeaccounting 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. Previously, I sat >> inside, 3 feet away through the glass, and got great signal. I wonder what 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 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 _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k