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[37.136.237.77]) by smtp.gmail.com with ESMTPSA id y1sm229130lfd.66.2021.05.16.12.20.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 16 May 2021 12:20:20 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.7\)) From: Jonathan Morton In-Reply-To: Date: Sun, 16 May 2021 22:20:19 +0300 Cc: bloat@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <487B5EAD-6FEE-482C-919E-D1F1B7166530@gmail.com> References: <6d93a3cf-7907-c50b-7903-79bd638b5766@indexexchange.com> To: john X-Mailer: Apple Mail (2.3445.9.7) Subject: Re: [Bloat] Terminology for Laypeople X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 May 2021 19:20:22 -0000 > On 16 May, 2021, at 9:48 pm, john wrote: >=20 > After watching Dave's YouTube video, it seems to me, the congestion of=20= > the packets which Dave was explaining is equivalent to sushi plats on=20= > conveyor stuck on the route and colliding each other on the conveyor=20= > since the conveyor keeps bringing more packets one after another to = the=20 > collision point, then plats overflow from the conveyor and dropped on=20= > the floor. >=20 > So now, my question is the picture I described above is close to what=20= > bufferbloat is? Or I am still very far from understanding? If I am = still=20 > far from understanding, will you be able to explain it to me, the=20 > laypeople, using the sushi or donuts conveyor? Is the problem the = speed=20 > adjustment of the conveyor? Or too many plates or donuts are placed on=20= > the conveyor? If so, why the rate or speed of each factors can not be=20= > adjusted? I even wonder if you could explain it using the door to door=20= > package delivery service since you are talking about delivering = packets. Here's an analogy for you: Today there is a logging operation going on just up the road - not = unusual in my part of the world. They have a team felling trees, = another team trimming off the branches, and the trunks are then stacked = for later delivery to the sawmill (*much* later - they have to season = first). The branches are fed into a chopping machine which produces = firewood and mulch, which is then weighed and bagged for immediate sale. I need firewood for my sauna stove. I know that if I load my trailer = full of firewood, it'll last me about a year. I figure I'll pay these = guys a visit, and it shouldn't take more than half an hour of my time to = get what I need. Under normal circumstances, that would be true. However, the hardware = store in the town an hour away has also chosen today to replenish its = stock of firewood, and they have a representative on site who's = basically buying the branches from every tree as it comes down; every so = often a big van turns up and collects the product. He graciously lets = me step in and buy the branches off one tree for my own use, and they're = tagged as such by the loggers. So instead of just loading ready-made bags of firewood into my trailer, = I have to wait for the trimming team to get around to taking the = branches off "my" tree which is waiting behind a dozen others. The = branches then go into a big stack of branches waiting for the chopping = machine. When they eventually get around to chopping those, the = firewood is carefully put in a separate pile, waiting for the weighing = and bagging. It takes a full hour before I have the branches from "my" tree in a = useful format for firing a sauna stove and in my trailer. Which is now = only half full. To fill it completely, I have to go through the entire = process again from the beginning - only the felling team has been going = gangbusters and there are now *twenty* trees waiting for trimming. I planned for half an hour. It actually took me three hours to get my = firewood. Not for lack of throughput - that was one pretty effective = logging operation - but because of the *queues*. - Jonathan Morton=