Unklejoe

17 ms·

121.
by Unklejoe 5y ago
That makes sense. It would also help from a cache prefetching perspective.
122.
by Unklejoe 5y ago
Is there a technical reason why little endian is better besides the fact that it's more popular due to x86/ARM? To me, big endian makes a lot more sense - integers are stored in the order which you read them (mentally). I do remem
123.
by Unklejoe 5y ago
> iterating through every possible value of a 256 bit key It's my understanding that when encryption gets "broken", it usually refers to something other than a simple brute force attack. Like, something that would make it
124.
by Unklejoe 5y ago
McMaster is great if you need some obscure bolt, but man do they stick you for it. Want this weird thread bolt? Here's a power plant certified 2mm bolt for $75 each.
125.
by Unklejoe 5y ago
> Is it not like our situation with the flu? Nope, and for the same reason COVID deniers who claimed "it's just like the flu" in the beginning were wrong.
126.
by Unklejoe 5y ago
There's a free 1000+ lb steel heatsink - the chassis of the car.
127.
by Unklejoe 5y ago
> Why would a resistor bank be better than mechanical brakes? Resistors don't wear out like frictional brakes do.
128.
by Unklejoe 5y ago
There is definitely some fat to trim. For example, I remember spending almost an entire marking period studying the poems from Edgar Allan Poe. Nothing personal against the guy, but it's largely useless knowledge for the majority of pe
129.
by Unklejoe 5y ago
For a SATA SSD, I would be surprised if it was different.
130.
by Unklejoe 5y ago
I'm wondering if it's really necessary to get at the block device directly. I'm able to saturate a PCIe 3.0 x4 link doing direct IO to an NVMe drive with a single 1.7 GHz Power PC core without breaking a sweat. This is throug
131.
by Unklejoe 5y ago
I was watching an interview with Tom Christiansen (he owns Neurochrome, a company that makes very high-end DIY amplifier designs/kits, with THDs of 0.0001%). He mentioned something about how resistor noise can actually track with the l
132.
by Unklejoe 5y ago
> Well bad news for all gas powered car owners: performance and mileage will degrade over time. Maybe not by a software update (unless you own a specific diesel car) but they will definitely degrade and quite significantly as well. This
133.
by Unklejoe 5y ago
> The new F-150 will be bigger and heavier than the absurdly huge early-00s Hummers. And a Tesla Model 3 long range is heavier than a 2020 F-150.
134.
by Unklejoe 5y ago
I feel like this same criticism should apply for the Model S Plaid then too since it accelerates faster than almost every car and is heavier than most cars as well. I’m not sure how much the weight really matters if you’re colliding with a
135.
by Unklejoe 5y ago
Autopilot is commonly lumped together with electric cars, but they’re really two completely unrelated things. It just so happens that one of the most popular autopilot implementations is on Tesla, but it could have just as well been impleme
136.
by Unklejoe 5y ago
I remember reading somewhere that poll was just a wrapper for select. I’m guessing that’s either outdated or false now.
137.
by Unklejoe 5y ago
> No new code should be using select(). Using it assumes the execution environment keeps all file descriptor values within FD_SETSIZE. What should we use instead? poll()?
138.
by Unklejoe 5y ago
This is also how I'd normally implement control systems in general. Sample the input, calculate, then set output.
139.
by Unklejoe 6y ago
Yep. Generally, "platform device" means that it's just a direct physical memory map. Honestly, from a driver perspective, that's sort of what you get with PCIe as well. The physical addresses is just dynamically determin
140.
by Unklejoe 6y ago
I feel like if you already know exactly how you're about to access the data, then it would be more efficient to be able to just tell the kernel rather than making it figure it out on its own. At the minimum, the first accesses would pe
141.
by Unklejoe 6y ago
They could start by preventing listings from being renamed. I have encountered several items with good reviews, but when you read the reviews, they're all talking about a completely different item.
142.
by Unklejoe 6y ago
That makes sense since that's the big fancy IBM Power chips. Most of the stuff I do is big endian 32 bit though. Some BE 64 (e6500, etc).
143.
by Unklejoe 6y ago
Does Rust support every architecture that the kernel supports? Seriously asking, not rhetorical. I get that new Rust code will be limited to modules, but here's my concern: I do work for embedded systems based on the PPC architecture.
144.
by Unklejoe 6y ago
It really depends on what you mean by "standard of care". Yes, there are a lot of people without coverage in the USA, and there are a lot of people in deep medical debt. However, when it comes to the actual quality of the healthca
145.
by Unklejoe 6y ago
I have an electric leaf blower and it's loud as hell. I think most of the noise comes from the high velocity air itself.
146.
by Unklejoe 6y ago
It's hard to do PTP reliably over WiFi since the symmetry in both directions (client<->ap) isn't really consistent. It _does_ sort of work though.
147.
by Unklejoe 6y ago
Right, but Ethernet timestamping usually occurs on a symbol or byte level inside the MAC, so for GigE, you're looking at 8 nanoseconds per symbol. This could be improved by oversampling the symbols, but at least with GigE, there's
148.
by Unklejoe 6y ago
Not necessarily when it comes to something like HFT, where they do things like run point to point microwave links to reduce latency by microseconds.
149.
by Unklejoe 6y ago
> To do PTP "right" requires every switch to support it and a NIC with hardware timestamps. I agree, but PTP will in fact work over regular commercial switches on a LAN. The problem is that it will introduce jitter if there&#x2
150.
by Unklejoe 6y ago
> How is instead dedicating a single core a worse solution? It is pretty much guaranteed to perform worse, if that's what you mean. Is it worth the effort and extra complexity? Probably not. The timestamping jitter with an FPGA woul

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