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Cloudflare's Gen 13 servers: trading cache for cores for 2x performance

https://blog.cloudflare.com/gen13-launch/
61•wmf•3d ago

Comments

gdwatson•1h ago
I will confess to skimming by the end. But I don’t think they explained how they solved the cache issue except to say they rewrote the software in Rust, which is pretty vague.

Was all the code they rewrote originally in Lua? So was it just a matter of moving from a dynamic language with pointer-heavy data structures to a static language with value types and more control over memory layout? Or was there something else going on?

zozbot234•1h ago
The gains in lower memory footprint and lower demands on memory bandwidth from rewriting stuff to Rust are very real, and they're going to matter a lot with DRAM prices being up 5x or more. It doesn't surprise me at all that they would be getting these results.
timacles•1h ago
This has to be an AI comment lol.
jshier•20m ago
They posted about the Rust rewrite last year. https://blog.cloudflare.com/20-percent-internet-upgrade/
danpalmer•1h ago
The tradeoff: The opportunity: Proving it out:

Nah I'm good thanks. Slop takes more effort to read and just raises questions of accuracy. It's just disrespectful to your reader to put that work on them. And in a marketing blog post it's just a bad idea.

montyanne•1h ago
Cloudflare has excellent (human) technical writers. I don’t see any indication this is “slop”, it’s the standard in-the-weeds but understandable blog post they’ve been doing for years.

AI text is everywhere, but this isn’t it.

rustystump•1h ago
Agree to disagree. It is likely ai enhanced some where along the path to production. So many phrases reek AI but others do not. Is this a sprinkling of llm help or how a human genuinely writes, idk.
abuani•1h ago
Out of curiosity, can you point to specific sections that reel of AI? I read the article and didn't see anything that immediately stuck out, but maybe I need to start looking for different signals.
refulgentis•52m ago
This is AI, but I can’t prove it, lol. :) The bulleted lists that are too short both in total list length and text per list item length. littles drama headers as parent noted.

To your point, this would register as “human bloviating for word count subtly” if llms didn’t exist, and at this point is probably the most useful feedback. I doubt it’s 100% one-shot AI, but someone definitely optimized it in parts, but the AI heard “concise” as “bullets and short sentences.”

rustystump•1h ago
“ deliver more than just a core count increase. The architecture delivers improvements across multiple dimensions”

“But we didn't just assume it would be a problem; we measured it.”

“ Instead of compromising, we built FL2. ”

Idk if i am now seeing this pattern everywhere because it is all AI slop or if people really do write this way.

Skimming it, this looks like they got a partnership with amd and tacked it onto an ongoing project as if it were planned. This confuses us as it makes it harder to understand how much was the rewrite generally or was it some hardware thing? Man, i used to really enjoy cloudflares technical blogs.

trhway•1h ago
Reminds that time when cheap Celeron with small cache was beating expensive Pentium with large cache (if i remember correctly that Celeron's cache was running at the core frequency while Pentium's was a separate die on half-frequency, and Celeron was very overclockable)
BoredPositron•1h ago
Pentium 4 the first release. AMD had the same gimmick with their Phenoms.
zozbot234•1h ago
Lower cache per core is actually a pretty natural outcome with the latest device fabrication nodes shrinking logic while leaving the size of SRAM largely unchanged. We may perhaps also see eDRAM (a lot denser than SRAM) for last-level caches.
attentive•1h ago
That was annoying to read because there is no easy to see impact of each change. It's FL2 + Gen 13 combined.

I.e. what's the FL2 benchmark on Gen 12 compared to FL1?

alberth•1h ago
It seems like the unspoken takeaway is just how shockingly performant LuaJIT is, even relative to Rust.
anitil•18m ago
They said they're replacing 15 years of Nginx+Lua, that's a testament to how good it can be.
synack•5m ago
Is the Linux scheduler aware of shared CPU cache hierarchies? Is there any way we could make the scheduler do better cache utilization rather than pinning processes to cores or offloading these decisions to vendor specific code?

Deploytarot.com – tarot card reading for deployments

https://deploytarot.com/setup
127•rembish•3h ago•25 comments

Why so many control rooms were seafoam green (2025)

https://bethmathews.substack.com/p/why-so-many-control-rooms-were-seafoam
522•Amorymeltzer•1d ago•101 comments

Show HN: I put an AI agent on a $7/month VPS with IRC as its transport layer

https://georgelarson.me/writing/2026-03-23-nullclaw-doorman/
26•j0rg3•1h ago•12 comments

DOOM Over DNS

https://github.com/resumex/doom-over-dns
189•Venn1•3d ago•64 comments

New York City hospitals drop Palantir as controversial AI firm expands in UK

https://www.theguardian.com/technology/2026/mar/26/new-york-hospitals-palantir-ai
248•chrisjj•3h ago•94 comments

Chicago artist creates tourism posters for city's neighborhoods

https://www.chicagotribune.com/2026/03/25/chicago-neighborhood-posters/
9•NaOH•48m ago•3 comments

Moving from GitHub to Codeberg, for lazy people

https://unterwaditzer.net/2025/codeberg.html
501•jslakro•10h ago•250 comments

My minute-by-minute response to the LiteLLM malware attack

https://futuresearch.ai/blog/litellm-attack-transcript/
271•Fibonar•8h ago•120 comments

CERN to host a new phase of Open Research Europe

https://home.cern/news/news/cern/cern-host-europes-flagship-open-access-publishing-platform
178•JohnHammersley•4h ago•16 comments

Show HN: Veil – Dark mode PDFs without destroying images, runs in the browser

https://veil.simoneamico.com/
17•simoneamico•12h ago•0 comments

John Bradley, author of xv, has died

https://voxday.net/2026/03/25/rip-john-bradley/
194•linsomniac•5h ago•58 comments

HyperAgents: Self-referential self-improving agents

https://github.com/facebookresearch/hyperagents
116•andyg_blog•2d ago•49 comments

OpenTelemetry profiles enters public alpha

https://opentelemetry.io/blog/2026/profiles-alpha/
141•tanelpoder•7h ago•15 comments

Anthropic Subprocessor Changes

https://trust.anthropic.com
18•tencentshill•2h ago•17 comments

Using FireWire on a Raspberry Pi

https://www.jeffgeerling.com/blog/2026/firewire-on-a-raspberry-pi/
42•jandeboevrie•3h ago•21 comments

Show HN: Turbolite – a SQLite VFS serving sub-250ms cold JOIN queries from S3

https://github.com/russellromney/turbolite
99•russellthehippo•5h ago•24 comments

Whistler: Live eBPF Programming from the Common Lisp REPL

https://atgreen.github.io/repl-yell/posts/whistler/
9•varjag•3d ago•0 comments

We haven't seen the worst of what gambling and prediction markets will do

https://www.derekthompson.org/p/we-havent-seen-the-worst-of-what
510•mmcclure•4h ago•355 comments

How much precision can you squeeze out of a table?

https://www.johndcook.com/blog/2026/03/26/table-precision/
38•nomemory•4h ago•4 comments

Show HN: Fio: 3D World editor/game engine – inspired by Radiant and Hammer

https://github.com/ViciousSquid/Fio
23•vicioussquid•3h ago•3 comments

Apple Discontinues Mac Pro

12•alifeinbinary•55m ago•6 comments

Order Granting Preliminary Injunction – Anthropic vs. U.S. Department of War [pdf]

https://storage.courtlistener.com/recap/gov.uscourts.cand.465515/gov.uscourts.cand.465515.134.0.pdf
33•theindieman•55m ago•2 comments

Stripe Projects: Provision and manage services from the CLI

https://projects.dev/
98•piinbinary•8h ago•28 comments

Colibri – chat platform built on the AT Protocol for communities big and small

https://colibri.social/
96•todotask2•6h ago•51 comments

We Rewrote JSONata with AI in a Day, Saved $500K/Year

https://www.reco.ai/blog/we-rewrote-jsonata-with-ai
55•cjlm•1h ago•50 comments

Fast regex search: indexing text for agent tools

https://cursor.com/blog/fast-regex-search
24•jxmorris12•2d ago•5 comments

Running Tesla Model 3's computer on my desk using parts from crashed cars

https://bugs.xdavidhu.me/tesla/2026/03/23/running-tesla-model-3s-computer-on-my-desk-using-parts-...
847•driesdep•1d ago•297 comments

From zero to a RAG system: successes and failures

https://en.andros.dev/blog/aa31d744/from-zero-to-a-rag-system-successes-and-failures/
274•andros•2d ago•84 comments

My home network observes bedtime with OpenBSD and pf

https://ratfactor.com/openbsd/pf-gateway-bedtime
110•ibobev•3d ago•31 comments

The Little Book of C

https://little-book-of.github.io/c/books/en-US/book.html
58•ghostrss•3h ago•16 comments