Slashdot Mirror
Is Your Internet Connection Free From Bufferbloat? (blogspot.com)
Bufferbloat is that "undesirable latency that comes from a router or other network equipment buffering too much data," according to the site for
an ongoing project trying to address it. Now long-time Slashdot reader mtaht writes:Inside the lede-project, two core new bufferbloat-fighting techniques are poised to enter the linux mainline kernel and thousands of routers -- the first being a fq-codel'd and airtime fair scheduler for wifi, and the second, the new "cake" qdisc, which outperforms fq_codel across the board for shaping inbound and outbound connections.
His submission ends with a question for Slashdot readers. "It's been nearly six years since the start of the bufferbloat project. Have you or has your ISP fixed your bufferbloat yet?"
His submission ends with a question for Slashdot readers. "It's been nearly six years since the start of the bufferbloat project. Have you or has your ISP fixed your bufferbloat yet?"
If you are referring to the cake article, the baseline latency of the path is ~11ms. It grows to about 250ms under pressure from a tcp transfer with a "normal" cable modem, and to only 16ms or so with cake. See the bar graph... wifi could get much much worse. but we fixed it in the upcoming linux 3.10 release. Not that anybody seems to understand....
It is entirely probable we've been inside our own filter bubble so long (6 years) we cannot properly communicate with first time readers! some folk explaining the problem... the ietf video shows the benefit from fixing it. https://www.bufferbloat.net/pr... showing the extent: http://www.dslreports.com/spee... you have this entirely backwards: "Buffering can reduce latency, especially under heavy load, by better bandwidth utilization, and allowing faster retransmission of dropped packets. If it is slowing things down, then you should fix the buffering rather than eliminating it." You want enough buffering to absorb bursts, but any more just adds latency. Van Jacobson and kathie nichols calls this distinction good queue and bad queue: https://tools.ietf.org/html/dr... Less buffering (and fair queuing) allows for faster retransmission in particular.