Oct 15, 2026, 5:46 PM@techokami > The end result is an order-of-magnitude speedup for a read()-heavy benchmark. Review has already identified a race condition in the code, though, so further work will be needed.
every time
- Oct 15, 2026, 5:46 PM
Replies
linear cannonlinear@nya.socialOct 15, 2026, 5:47 PM@zzt@mas.to @techokami@woof.tech just a thought, but, maybe, perhaps, just possibly, the code was an order of magnitude slower than it could have been because it needed to be in order to avoid a race condition.
Oct 15, 2026, 5:52 PM- linear cannonlinear@nya.socialOct 15, 2026, 5:53 PM@techokami@woof.tech @zzt@mas.to this just so happens to be precisely the part of the kernel i wouldn't want even the top brass vibecoding. soooooo many mistakes are made in RCU.
- Oct 15, 2026, 5:57 PM
@linear @techokami I love how hard the LWN comments are trying to talk over how damning this result is, including accusing the author of uhhh not glazing torvalds enough?
- Oct 15, 2026, 6:03 PM
- Oct 15, 2026, 6:09 PM
@techokami @linear god, he really is transforming before our eyes into the LLM guys at work who think their job is to shift blame to their coworkers and always find a way to make their mistakes someone else's problem in review
- Oct 15, 2026, 6:10 PM
@zzt @linear should post the exact message he did this in: https://lwn.net/ml/all/CAHk-=wiCe2H33izZHDyDHEhcFwUr9fXZk27-WZ2vn_pn5FcZTg@mail.gmail.com/
- Oct 15, 2026, 6:11 PM
@techokami @linear I can't emphasize enough how much all of this, down to pretending prompting is a skill and it's everyone else's fault for not picking it up, and being overly impressed with basic editor tasks because the LLM did them, is all shit I've seen from LLM addicts in a commercial setting
Weekend Editorweekend_editor@mathstodon.xyzOct 15, 2026, 11:47 PMJust wait 'til they rediscover regular expressions.
Oct 16, 2026, 6:36 AM@zzt @techokami @linear he always have been. This is only a revelator bath.
Cassandrichdalias@hachyderm.ioOct 15, 2026, 11:40 PM@techokami @linear @zzt RCU is a huge mistake, one of the first changes that made the kernel vastly worse than it used to be. Nobody understands it or has a good formal model for correctness of it, and it pays in late-failing resource allocations (= no way to recover under resource exhaustion, boom!) as a tradeoff to eliminate logically-necessary locking, for the sake of performance on highly-parallel loads on highly-parallel machines. For us normal folks, it's just worse in all ways.
- Oct 16, 2026, 6:38 AM
@dalias @techokami @linear @zzt ah I though I found this shit overly complex because I'm just a systems noob.
LisPilispi314@udongein.xyzOct 17, 2026, 8:07 PM@dalias @techokami @linear @zzt The RCU sounds like the kind of thing that shouldn't be written without starting with formal methods and a full TLA+ model.
- Oct 15, 2026, 5:48 PM
- Oct 15, 2026, 5:55 PM
@techokami would you be surprised to know that this is more or less how all the other vibecoded systems projects went too? there’s a scathing code review of anthropic’s C compiler out there
Dźwiedziudzwiedziu@mastodon.socialOct 15, 2026, 5:52 PM@zzt
He must've been prompting it wrong.- Oct 15, 2026, 5:53 PM
@dzwiedziu @techokami bbbut his bulletproof prompt that only a skilled programmer could’ve come up with (no you can’t see it)
(🖬🖫). ₍^. .^₎⟆discatte@digipres.clubOct 15, 2026, 5:56 PM@zzt @dzwiedziu @techokami This is why I only program by using an OUIJA board to pick page numbers from the C reference book.
- Oct 15, 2026, 5:57 PM
@discatte @zzt @dzwiedziu quote of the day
Roamin' Chemicalsroaminchemicals@mastodon.socialOct 15, 2026, 7:29 PM@discatte @zzt @dzwiedziu @techokami I only program using an OUYA game console. No you can't know how I get the controller to connect consistently, serious developers only. If you're poor every compiler has a free demo.
aburka 🫣aburka@hachyderm.ioOct 15, 2026, 6:11 PM@zzt @techokami lol, lmao
Oct 15, 2026, 6:19 PM@zzt Guess i'm taking a second whack at sorting out the X driver problem on my FreeBSD install ...
Oct 16, 2026, 2:13 AMthe classic 'we can make it WAY faster if we don't need it to work, but trust me I'm 90% of the way there now'
- Oct 16, 2026, 6:41 AM
@Patashu @zzt @techokami we all know the last 10% take 90% of the time, but with llms, it's much worse.
- Oct 16, 2026, 6:35 AM
@zzt @techokami "thats fine, the holy orange asshole will fix it when asked politely"
