davecb

5 ms·

1.
by davecb 1y ago
It's certainly killing companies, and multiple products that are open source. However, the community has the experience and knowledge to push back. Consider the Hashicorp license change in Terraform. A small community of businesses us
2.
by davecb 2y ago
Unconfirmed reports have Australia, Canada, New Zealand and the United Kingdom considering dropping the United States from the five eyes, and inviting the EU in its place. The putative reason is that they are concerned about the shared info
3.
by davecb 2y ago
That's just a comparison to Star Trek, which is set in an imaginary universe where things _do_ exceed the speed of light.
4.
by davecb 2y ago
Yup, it was Rogers, which is what my building has, and which I'm stuck with for TV. Other, luckier, people can have Bell (sorta-maybe better) or TekSavvy (definitely better) The terrible performance is spotty: that was a particularly g
5.
by davecb 2y ago
On of my _evil hidden agendas_ is making end-users aware that their ISP (Rogers, anyone?) is doing a terrible job, and someone like TekSavvy can solve their problems for them (;-))
6.
by davecb 2y ago
Hi, Dave here. I recommend using a small box running LibreQoS adjacent to the big router. Large-scale routers based on Application-Specific ICs do a wonderful job, but are hard to change. Having a transparent fix in an inexpensive device
7.
Your Network Is Slow (:-)) [video](vimeo.com)
1 points by davecb 2y ago|1 comments
8.
by davecb 2y ago
I have another article in the "You Don't Know jack" series from the ACM, now in the November Communications of the ACM (the print magazine), and a 5-minute video about it at https://vimeo.com/1017926413 This
9.
by davecb 3y ago
Sorry, I think you are thinking of something else. Maybe a railroad crossing (:-)) Joking aside, the https://www.waveform.com/tools/bufferbloat test looks to see if the networking software is working correctly by putti
10.
by davecb 3y ago
Oh goodness no, always measure latency under full load, in the middle of the bandwidth test. A convenient example is https://www.waveform.com/tools/bufferbloat which can easily tell crappy ISPs from good ones
11.
by davecb 3y ago
> Latency to where? Greyface also asks "Latency is an end-to-end metric which will almost always involve path components beyond the control of your ISP - can and should they be held responsible for those paths?" The latency yo
12.
by davecb 3y ago
I often get spikes of delay showing up in https://test.vsee.com/network/index.html while on conference calls. Those correspond to periods in which speakers "sound like aliens", "have fallen down a well&q
13.
by davecb 3y ago
The bottleneck device can change with every different destination, so CAKE and fq_codel find it the same way older TCP code did: increase the load until they get a timeout or a "slow down, you idiot" flag (:-)) The initial bandwid
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by davecb 3y ago
ACM noticed a trend and created the "You Don't Know Jack" series to capture more of them.
15.
by davecb 3y ago
I was attracted to my current employer when the ops director said almost exactly what you did in your last sentence. He wanted our dev/ops arm to be numerate and to work in dollars and TPS. We actually do capacity planning in dollars
16.
by davecb 3y ago
Some times the tag line is what needs to be used: I see HN quoted it, so we're doing something right...
17.
by davecb 3y ago
I do exactly that plot, usually for CPU, occasionally for rotating-rust disks or for memory in non-GC languages. If a day's normal variation doesn't make a machine busy enough, I usually fiddle with the load-balancer to git it mor
18.
by davecb 3y ago
I entirely agree: I used to run the performance team at Sun Canada, and 99% of the time, we were on a bottleneck-hunt. Annoyingly, the bottleneck was rarely in the first place we looked (;-)) Benchmarks are well-known, well-understood and
19.
by davecb 3y ago
Did the tag line "How capacity planners credibly estimate application performance (acm.org)" show up? The ACM series is called "you don't know jack", but the tag line is supposed to distinguish it from all the other
20.
by davecb 3y ago
Yes, every resource-exhaustion causes a bottleneck, and a queue builds up. My effort here is to try and tell people to look in the right place to spot the bottleneck. That's a lot easier than a measurement exercise. I sort of lump the
21.
by davecb 4y ago
"Packet loss" is more interesting to nerds than consumers, who don't know what it means. Arguably it needs a better name. "Delays due to retransmission" is short enough to fit the label, and is what a packet loss me
22.
by davecb 10y ago
From thew point of view of a capacity planner and performance engineer, one goes for low latency first, because for many algorythms, the best throughput is seen when latency is lowest. Some cases will be different, but starting with removi
23.
by davecb 10y ago
I keep seeing papers with the lede paragraph and sometimes the conclusions written in a different voice that the rest of the paper. I suspect "men of good faith but limited understanding" are contributing to the editing (;-))