lmb
Joined 13 years ago
Karma
262
Submissions
88
Member since
Oct 28
Programmer
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Comment · 1 year ago
Location: London, UK / Munich, Germany
Remote: No, hybrid only
Willing to relocate: Maybe
Technologies: Go, C, eBPF, Linux
Résumé/CV: on request
Email: [email protected]
I’m self taught, learn by doing and enjoy going deep on a specific subject. After working as a fully remote open source maintainer I’m looking for a small team that values collaborating in person, in a strategic role owning a domain or problem space, with a view to leading a team.
I’m curious about problems that require exceptional performance and / or reliability in areas like power infrastructure, renewable energy, operating AI models at scale, non-LLM AI, hardware.
Comment · 4 years ago
Counter point from Gleixner which is worth reading for us in the peanut gallery: https://lwn.net/ml/linux-kernel/87r11qp63n.ffs@tglx/
Comment · 4 years ago
Missing Allen (2001) by my late father Christian Bauer
https://www.youtube.com/watch?v=kOXSI_vcqK8
Around the turn of the century, my dad's good friend and longtime collaborator Allen Ross vanishes from one day to the next, just after they have finished shooting a film about the Mississippi. Years later, my dad returns to the US to find out what happened to his friend.
It's his most personal film for sure, and I remember him going off to the US for weeks and faxing us letters to keep in touch. It's also the one that had him most scared, he took out life insurance before he left because of the people he was looking into.
Comment · 4 years ago
We ended up with fasthash64 and lookup3 by looking for a fast hash that is easy to port to the restricted subset of C supported by eBPF with minimal changes. https://github.com/rurban/smhasher is a great resource for that.
I would probably choose different, more robust hash functions if I was targeting regular C.
Comment · 4 years ago
I think we tried siphash at some point, unfortunately it's significantly slower than the two hash functions we ended up using.
Comment · 4 years ago
Count min sketches are really neat. A colleague at my old company used them to implement DDoS mitigations in eBPF and wrote it up: https://blog.cloudflare.com/building-rakelimit/
The code is also open source, and I've improved on it a bit: https://github.com/lmb/socklimit Not production ready but a cool idea and implementation.
Comment · 4 years ago
We don't use kernel bypass anymore, it's all XDP: https://blog.cloudflare.com/l4drop-xdp-ebpf-based-ddos-mitig...
Comment · 5 years ago
What does tail latency for the Zig pool look like? It seems like any Task that ends up in one of the overflow queues will stay there until at some ring buffer is emptied.
Put another way, during a period of more push than pop some tasks may see a very long delay before being worked on?
Comment · 5 years ago
What does tooling / debugging for p4 look like? How do you inspect what happens inside a p4 dataplane?
Context: I work on a L4 load balancer written in ebpf / XDP. Debugging that is still too hard even thought it's all software and open source.
Comment · 5 years ago
There is a fair bit of co-evolution of the Linux BPF verifier and the BPF llvm backend. This means that the verifier is biased to do well on bytecode that is commonly emitted by clang. I can imagine that other programming languages will run into the verifier rejecting their output if it differs to much from common clang output. (There is redbpf which compiles rust to BPF AFAIK, but it still uses llvm. There is also a gcc BPF backend, but I don't have experience with that.) The good news is that Linux upstream is receptive to bug reports!
Comment · 5 years ago
Seems like the right move from a volunteer run project, what will the future will hold though? Artificial scarcity is always a problem.
On another note, for just 20k$ I can offer you exclusive use of the xxgfzrf.dinglebop.me Public Suffix so that you can keep tracking your users. Please reach out to [email protected] if you are interested.
Comment · 5 years ago
You're arguing that the majority of people use the term differently than you and are therefore wrong. Sounds like the definition of technobabble to me.
Comment · 6 years ago
Total shot in the dark: I had a similar problem, it turned out the power supply for the router was faulty.
Comment · 7 years ago
Can you define ready? The functionality of the library is solid, it's based on code we're using in production. We've not committed to a stable API however.
(I'm one of the maintainers of said library.)