Low-e glass, it’s a thin metallic film used to reflect infra-red to keep heat in or out. Totally blocks/reflects RF. Simon > On Nov 19, 2018, at 4:20 PM, Ben Greear wrote: > > On 11/19/2018 04:13 PM, Dave Taht wrote: >> On Mon, Nov 19, 2018 at 3:56 PM Ben Greear wrote: >>> >>> On 11/19/2018 03:47 PM, Dave Taht wrote: >>>> On Mon, Nov 19, 2018 at 3:30 PM Simon Barber wrote: >>>>> >>>>> >>>>> >>>>> On Nov 19, 2018, at 2:44 PM, Toke Høiland-Jørgensen wrote: >>>>> >>>>> Dave Taht writes: >>>>> >>>>> Toke Høiland-Jørgensen writes: >>>>> >>>>> Felix Fietkau writes: >>>>> >>>>> On 2018-11-14 18:40, Toke Høiland-Jørgensen wrote: >>>>> >>>>> This part doesn't really make much sense to me, but maybe I'm >>>>> misunderstanding how the code works. >>>>> Let's assume we have a driver like ath9k or mt76, which tries to keep a >>>>> >>>>> …. >>>>> >>>>> >>>>> Well, there's going to be a BQL-like queue limit (but for airtime) on >>>>> top, which drivers can opt-in to if the hardware has too much queueing. >>>>> >>>>> >>>>> Very happy to read this - I first talked to Dave Taht about the need for Time Queue Limits more than 5 years ago! >>>> >>>> Michal faked up a dql estimator 3 (?) years ago. it worked. >>>> >>>> http://blog.cerowrt.org/post/dql_on_wifi_2/ >>>> >>>> As a side note, in *any* real world working mu-mimo situation at any >>>> scale, on any equipment, does anyone have any stats on how often the >>>> feature is actually used and useful? >>>> >>>> My personal guess, from looking at the standard, was in home >>>> scenarios, usage would be about... 0, and in a controlled environment >>>> in a football stadium, quite a lot. >>>> >>>> In a office or apartment complex, I figured interference and so forth >>>> would make it a negative benefit due to retransmits. >>>> >>>> I felt when that part of the standard rolled around... that mu-mimo >>>> was an idea that should never have escaped the lab. I can be convinced >>>> by data, that we can aim for a higher goal here. But it would be >>>> comforting to have a measured non-lab, real-world, at real world >>>> rates, result for it, on some platform, of it actually being useful. >>> >>> We're working on building a lab with 20 or 30 mixed 'real' devices >>> using various different /AC NICs (QCA wave2 on OpenWRT, Fedora, realtek USB 8812au on OpenWRT, Fedora, >>> and some Intel NICs in NUCs on Windows, and maybe more). I'm not actually sure if that realtek >>> or the NUCs can do MU-MIMO or not, but the QCA NICs will be able to. It should be at least somewhat similar >>> to a classroom environment or coffee shop. >> >> In the last 3 coffee shops I went to, I could hear over 30 APs on >> competing SSIDs, running G, N, and AC, >> occupying every available channel. > > I especially like when someone uses channel 3 because, I guess, they > think it is un-used :) > > 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. > > Thanks, > Ben > > > -- > Ben Greear > > Candela Technologies Inc http://www.candelatech.com