A leap second is added. The system goes "oh shit, I'm a second ahead", and subtracts a second. And that's how you get a negative duration and exactly this problem.

Whereas if a leap second is subtracted, you get charged for an extra second.

Both can be used for targeting.

> Direction finding equipment for determining bearings to specific electromagnetic sources or terrain characteristics specially designed for defense articles in paragraph (a)(1) of USML Category IV or paragraphs (a)(5), (a)(6), or (a)

ITAR part 121.

The "specifically designed for defense" probably makes this OK, but IANAL.

Not all mobile data APNs go to the Internet. You can't resell an IP service that lands on an RFC1918 network with exactly one IP:port available; the API endpoint.

Not saying I've seen this in devices, but I have built and run mobile data networks with private APNs.

The first phased array systems date back to 1905.

We have had some time to productionize this.

Hell, the "PA" in "PATRIOT missile" stands for "Phased Array".

https://x.com/ThermoInstagram/status/909356506059026432

Also for checking if microwaved food is ready.

We'll just get some poorly coded stuff claim that an operation took 1100ms instead of 100ms. Not great, but not -900ms.

Well, I say that, but per my link here F5 load balancers at least used to keep track of TCP connections using gettimeofday. And it's annoying that libpcap delivers metadata in wallclock time.

[1] https://blog.habets.se/2010/09/gettimeofday-should-never-be-...

Specifically grafana is nice to be able to see on the phone, and split horizon DNS and corp VPN is a hassle, to say the least, on phones.

I bet you can do it with HA-Proxy, but I use https://github.com/ThomasHabets/sni-router

Ok. Hacking me by changing the input to my Jekyll rather involves being on the other side of the airtight hatch.

It's just LARPing.

2. 2026? Cryptocurrency was always just hell. Well, before it was hell it was LARP.

When I worked (well, was a contractor at) a very large company, they'd kicked out all their small contracting providers only to get the same people back via a single big one. I was told this was part of a vendor consolidation move, because maintaining their existing direct relationship with literally hundreds of thousands of vendors had a huge cost in itself.

I doubt they were dumb enough to think there was no markup, but going direct isn't free either. There ain't no such thing as a free lunch.

Now, was it a net good move? That's both above my pay grade and not my expertise. But from the fact it took me a month of billed time to buy a license of that same company's own product[1], I wouldn't have called it an efficient bureaucracy.

[1] all purchases of own-company product had to be done through the 99% internal billing discount program.

But it's a relevant reply to both comments, so copied here:

Yes, my understanding is that I should be able to emulate sendfile via splice. The problem with that is that splice requires one end to be a pipe. So I think this means two extra file descriptors per connection (one per side of the pipe). And per connection this adds 5 slots in the submit/completion queue, with a LINK dependency. Maybe the trade off is worth it. I've not done concrete experiments with it, but I'm guessing it would be if the saved copy_from_user is large enough.

So for optimal performance this may mean using write() for short files, and a pipe(), a pair of splice() calls, and a pair of close() calls, for larger files.

So I think this means two extra file descriptors per connection (one per side of the pipe). And per connection this adds 5 slots in the submit/completion queue, with a LINK dependency. Maybe the trade off is worth it. I've not done concrete experiments with it, but I'm guessing it would be if the saved copy_from_user is large enough.

So for optimal performance this may mean using write() for short files, and a pipe(), a pair of splice() calls, and a pair of close() calls, for larger files.

Edit: I guess I could save some ops by reusing pipes, but then I'd have to make sure to flush them. Would add some complexity.

But really, I want to sendfile with io_uring, but that's not supported yet.

My writeup, with extra buzzwords like Rust and kTLS: https://blog.habets.se/2025/04/io-uring-ktls-and-rust-for-ze...

It was on HN too: https://news.ycombinator.com/item?id=44980865