Security and open source at the hardware/software interface. Embedded sec @ IOActive. Lead dev of ngscopeclient/libscopehal. GHz probe designer. Open source networking hardware. "So others may live"
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npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Profile Code
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2026-02-07T03:21:10Z Event JSON
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Last Notes npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…azw7 i'm sure one will get killed off, just like microchip buying atmel and dead ending the MIPS PIC32 line in favor of the new ARM based PIC32s that are just SAMs in a trench coat npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vnlz what do you mean there's nothing wrong with in band signaling npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…fz8u just watch out for flyback :p npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…fz8u yeah i have the scopehal / ngscopeclient channel bridged to discord because some users demand it, but I'm an irc lifer for sure npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…fz8u what about IRC? npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vntm @nprofile…0f4l (I could totally see the pilots being half awake, seeing the autoland in progress, then deciding it would probably fly better than they would in their current state and sitting back to watch the view) npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vntm @nprofile…0f4l And I'll take this outcome over an F-18 following the ting until it runs out of fuel any day npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vntm @nprofile…0f4l Yeah it's all speculation since all we have is statements of an obviously unreliable witness. Without CVR tapes or something we'll never know how conscious (or not) they were. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…0f4l But of course this is based on pilot statements and the brain is weird on hypoxia. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…0f4l see https://www.ainonline.com/aviation-news/business-aviation/2025-12-23/king-air-b200-lands-after-garmin-autoland-activation npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…0f4l From the sources I've seen, it wasn't a true incapacitation (but it was very close to being one). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…k6gw @nprofile…vnlz That's what superb bowel sunday is about! Have you had a colon cancer screening lately? If not, consider this a reminder. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…mvvp thaaat's not cursed at all... npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…l9z3 If you haven't seen my short story "Terminal Pacifism" you might appreciate it... https://serd.es/2025/10/31/Terminal-Pacifism.html npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vnlz No idea, but super bowel sunday is coming up so I thought I'd share some trivia. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Did you know the average human large intestine is about 1.5 meters long? [1] npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…au3r @nprofile…3qha DU is... Not nearly spicy enough to do that npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Also the Ubuntu 24.04 tests are failing to initialize vulkan while the fedora tests can do so just fine. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg I have a test case for libscopehal that has recently started failing in the GitHub CI environment with a SIGSEGV. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…huwm The "coupler de-embed" block takes in forward and reverse port waveforms plus a s4p file of the coupler. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…huwm Dual directional coupler :D split the signal into separate forward and reverse outputs. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…mcmd As the owner of an oscilloscope with a list price (when it was new) in that same ballpark... I feel your pain lol. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg 15.6 kWh solar generation today, new record (unsurprisingly... the days are getting longer plus we are having a sunny spell). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Finally had time to sit down and do a GPU version of the constellation diagram filter. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8xvk 4.5 might be a little young for a cloud chamber. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…97sf i think you mean kdoption npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…k6gw whatever maglite aftermarket upgrade kits shipped with circa 2009? npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg We've looked at absorbance spectra of a bunch of magnatiles but she doesn't quite get all the details I'm trying to explain. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Comparing spectra of the incandescent and white LED bulbs npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Fine tuning the Lego spectrometer more. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…4424 Vulkan is mandatory for the application to run at all. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…kpre Not large, but I'm doing refactoring around that code and if it's going to get removed, now is the time. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…nhhd Yeah I'm currently leaning towards keeping the avx2/fma versions but removing the 512 npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…tm9j So what i'm hearing is, the space of systems that would be affected by me removing the AVX512 eye pattern block, keeping the generic, AVX2, AVX2+FMA, and GPU-with-int64 implementations, is the empty set or close enough it makes no difference? npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…tm9j I know old, like Haswell era, Intel iGPUs lacked int64 support but I thought (could be wrong) current models have it. And most of those don't have AVX512 (AVX2 makes more sense to keep at least for now). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Debating removing some of the AVX accelerated filter implementations in libscopehal for blocks that we now have GPU support. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…thd8 I read that as "branch prediction" npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…u57d Yeah I can't imagine an oil company being friendly to that lol. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…u57d And if you had no partial shading to worry about, you could probably use string inverters vs microinverters which would also be cheaper. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…u57d So first order estimate (you might have some savings due to economies of scale) you're talking about a suburban block of rooftops. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…u57d That would need quite the farm and/or a huge battery bank. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…4424 I'm not an expert on this since I don't normally do my own terminations, I pay Koaxis to deal with this for me :P npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg This was still way faster than the CPU version: the v0.1.1 CDR PLL took 75.5 ms on the CPU to run this benchmark, while the unevenly partitioned GPU version took about 12ms. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg The bug turned out to be calculating the number of samples processed per thread as (numSamples / numThreads) with integer math, rounding down. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Just fixed an interesting and subtle shader performance bug. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8vnr @nprofile…hucu That block diagram looks a lot more like the actual part than I'm used to. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8f6p Definitely won't be staying that long although I might be coming up the weekend before npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…6cfx @nprofile…3tsk stealth dicing ftw? npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…6cfx @nprofile…3tsk I've seen more deep cracks in substrate than BEOL, but sure that's a consideration as well npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Looks like I'm gonna be going to HARRIS at MPI-SP in Bochum again this year (March 23-25) npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk (the trick to not cracking the die is to go slowly, do the initial cut if any well short of the plane of interest, then use fine grits, like P1200 and smaller, as you approach the target... using a diamond saw or large abrasive to go through the silicon gives exactly the kind of cracks shown in the original image and they tend to propagate pretty far making it difficult to polish them out... not that they tried, that surface finish looks like P800 or something) npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk like this QFN is what I consider "eh, it'll do but I'm not thrilled, i've seen better" cross section quality npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk I get upset with myself when I do a package cross section and I can see a hairline scratch in the silicon under 100x magnification rather than a flawless mirror finish npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk i'm screaming internally at the cracks in the die and the poor surface finish on the polish. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…0hj6 TIL what the e in e-core stands for npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…0hj6 It took me a minute to realize that you weren't torturing your laptop by forcing it to "compile more than it ever should have on e". npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…q57v I have a somewhat more proper spectrometer in the lab from ASEQ Instruments (inexpensive, but "real"). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…q57v Just a random cheap prism from amazon, nothing special. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…gftk you know, if you actually spend your money to do useful things you won't have to worry about a wealth tax npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Some measurements from the lego spectrometer npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Introducing the kiddo to optical spectroscopy npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk the layout guy was not thrilled at the K_{64} topology we ended up with instead lol. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk it was basically an extension of an in-package NoC, we would have had all IO be handled by packages on the edges of the array. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk you would have been able to basically just put the packages next to each other and have like 2mm diffpairs between them npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk it was for a HPC project with a lot of fast interconnect... one proposed topology was a hexgonal lattice of chips on a PCB with the packages basically butting against each other, and short-reach SERDES die to die from each one to its neighbors on all six sides npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3tsk Years ago I worked on a silicon project that contemplated (but did not actually manufacture) a hexagonal BGA. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…gj0l And now I'm confused because I was very sure R+Y was "crew have mutinied" but now I can't find any references to it anymore and I see the same combo used for "keep clear at low speed" npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg If "codices" is the plural of "codex" does that mean the plural of "mutex" should be "mutices"? npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg New version: directly map CPU side staging buffer and run the shader against that buffer without moving to local memory first. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg So, I have an answer to my previous question about GPU transfer efficiency. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8f6p that requires it be plugged in directly, not remoted. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vnlz did you hit a 32 bit offset limit in gtkwave or something npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vnlz oh dear how big npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…r9vg RoCE is a long term plan but for now let's assume that's not an option npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg (the raw samples are written once per trigger then read once in the shader) npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Thinking about a potential performance improvement for overlapping compute and transfer operations in ngscopeclient. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…thd8 it's from 2014, my oldest rig, and I've generally targeted a ten year minimum lifespan. I think I'll be keeping a lot of my current hardware longer than that though npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…thd8 yeah i had originally been planning to maybe upgrade my microscope bench workstation in 2026 but... That's not looking too likely right now npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…thd8 yeah i haven't done a new build without ecc in a long time. It's just not worth the risk npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Ea-Nasir spotted npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…3y57 hardened tool steel and flexures on the same part? Now I'm curious... npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Are there any old school non-neural-network based speech recognition or TTS tools still out there (ideally open source)? Curious how much of the dark arts have been lost npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Another evening, another few filters getting OOM speedups. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…vnlz that was my reaction on reading the stm32mp2 official software toolchain docs. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…nhxp If someone actually wanted to play the capitalism game with this pitch, you'd take VC money, pay it all out to the engineers performing the service, and offer your services at a steep discount to the public to attract customers. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…nhxp (The point of the joke was to turn the AI grift on its head, tricking tech bros into hiring actual engineers and paying them a fair wage by telling them they're a bot lol). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…fz8u ROFL that's a fun confusion. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg (whether people would be willing to pay what it cost to pay the staff a fair industry rate for their services is another question, of course) npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Jokes aside i feel like there would be a market for a "consultant at your fingertips" service that had vetted professionals in a variety of disciplines on tap, for an hourly fee, for rapidly answering questions and bouncing ideas off npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Somebody should make an "AI chatbot" that actually connects you to a real expert in the field. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8244 oh I was thinking more like how probable it was that i know somebody who knows the elongated muskrat npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…dcqh Definitely good advice. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8244 although if you only count publications it's probably a lot larger npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…8244 what is your erdos number, out of curiosity? Mine is 3 (via Bulent Yener, Mark Goldberg). npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…czzc That is actually something I've thought about, being able to take explicit thresholds as an optional parameter. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…czzc About 38 last time I checked, it may be possible to optimize those shaders further. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Another evening of filter refactoring and optimization, a few more nice performance jumps. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg Got it down to 50 ms, a 15.8x speedup. I'd still like faster, but this will do for now. npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…kdgg @nprofile…2fsd does it still work? Don't crack it open if it still runs npub1cddglts94qutscms0qpmk87lel9m8xku7q0wr20u2th5fxvvunqqxz9vpd Andrew Zonenberg @nprofile…2fsd (YIG is opaque iirc, roughly the same appearance as tungsten carbide i think?)
