fdeweerdt (@fdeweerdt) profile picture

fdeweerdt

@fdeweerdt
github.com/deweerdt
Joined December 2008
  • Tweets502
  • Following332
  • Followers70
fdeweerdt retweeted
frevib (@hielkedv) profile picture
frevib@hielkedv19 Jan 2020
#io_uring vs #epoll: simple echo server. io_uring +99% performance, -45% cpu usage. Wow. @axboe @VincentFree. 🏆io_uring🏆. Try for yourself: io_uring: github.com/frevib/io_uring-e… epoll: github.com/frevib/epoll-echo…
Image from frevib (@hielkedv)
Image from frevib (@hielkedv)
Image from frevib (@hielkedv)
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fdeweerdt retweeted
Jens Axboe (@axboe) profile picture
Jens Axboe@axboe13 May 2019
Added basic link test cases and a cp(2) example using linked read and writes to liburing. Needs a bit of love (short reads, errors), consider it a tech demo. git.kernel.dk/cgit/liburing/…
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fdeweerdt retweeted
Fastly (@fastly) profile picture
Fastly
@fastly30 Apr 2019
Learn about QUIC, straight from the experts. Join @mnot, Jana Iyengar, and @kazuho for a lively lunch discussion about QUIC on May 21 in London. RSVP here: fastly.us/2PwP0JQ
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fdeweerdt retweeted
x0rz (@x0rz) profile picture
x0rz@x0rz23 Apr 2019
I need this in my life: a terminal user-interface for tshark termshark.io/
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Six Stages of Debugging Step 1 : That can’t happen. Step 2 : That doesn’t happen on my machine. Step 3 : That shouldn’t happen. Step 4 : Why does that happen? Step 5 : Oh, I see. Step 6 : how did that ever work?
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> we implemented our eBPF-based tracing tool that can sniff Unix domain sockets across an entire Linux host nccgroup.trust/us/about-us/n…
These views are based on the strong belief that people avoid strong static typing and structured environments not because they are unenlightened, but because dynamic types and the like are way better for prototyping. (I, personally, love to program in Python like it's OCaml.)
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Very impressive improvements to IOPS and latency reduction coming to @Ceph by the use of the io_uring interface which was added by @axboe to Linux kernel 5. github.com/ceph/ceph/pull/27…
os/bluestore: introduce new io_uring IO engine by rouming · Pull Request #27392 · ceph/ceph

os/bluestore: introduce new io_uring IO engine by rouming · Pull Request #27392 · ceph/ceph

This implements low-level IO engine, which utilizes brand-new io_uring IO interface: https://lwn.net/Articles/776428/ The following basic config was used for fio_ceph_objectstore: rw=randwrite ...

github.com
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Facebook PE Summit Seattle keynote slides, you know you want it: vger.kernel.org/~davem/FB_Ap…
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> find all sorts of curious C language features that are rarely seen, like unnamed zero sized bitfields
Arnaldo Carvalho de Melo (@acmel) profile pictureArnaldo Carvalho de Melo@acmel17 Apr 2019
pahole 1.13 is out, go check it out: lore.kernel.org/lkml/2019041… #pahole #bpf #btf #dwarf
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Chrome Delays Requests On Slow Connections, Even With HTTP/2 - blog.josephscott.org/2019/04…
Chrome Delays Requests On Slow Connections, Even With HTTP/2

Chrome Delays Requests On Slow Connections, Even With HTTP/2

While looking at recent WebPageTest results I noticed something odd about them. The ordering of HTTP/2 requests weren’t happening in the way I expected, which eventually led me to reach…

josephscott.org
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One visit to a website, and unbeknownst to you your browser can be enlisted in a botnet and remain under control even when you leave the site... blog.acolyer.org/2019/04/12/…
Image from Adrian Colyer (@adriancolyer)
Image from Adrian Colyer (@adriancolyer)
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fdeweerdt retweeted
hanno (@hanno) profile picture
hanno@hanno12 Apr 2019
Maybe this is trivial, but the purpose of DoH/ESNI is largely defeatet if OCSP without stapling is used. (OCSP is plain HTTP and if you look at browser traffic these days it makes up a large amount of the remaining HTTP traffic.)
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A nice workaround to deal with the close(listener)/accept() race.
jkbs (@jkbs0) profile picturejkbs@jkbs010 Apr 2019
Ever wondered if you can attach a BPF filter to your TCP listen socket? sweetness.hmmz.org/2015-07-2…
fdeweerdt retweeted
apenwarr (@apenwarr) profile picture
apenwarr@apenwarr9 Apr 2019
Finally, some friends and I are ready to soft-announce the startup we've been working on: Tailscale.io. We're working on a thesis that most modern tech architecture is "too scalable," and that slows down development of features that actually matter.
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Just released: v. 0.1.0 of skiparray, an unrolled skiplist library for C github.com/silentbicycle/ski… This is the first public release.
GitHub - silentbicycle/skiparray: unrolled skip list library for C

GitHub - silentbicycle/skiparray: unrolled skip list library for C

unrolled skip list library for C. Contribute to silentbicycle/skiparray development by creating an account on GitHub.

github.com
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fdeweerdt retweeted
Jens Axboe (@axboe) profile picture
Jens Axboe@axboe6 Apr 2019
Now that io_uring will be in the upcoming 5.1 kernel, I spent some time writing up how it came to be and how it works. More formats likely coming, and I expect a few revisions too. For now, consider this v1.0 of the doc: kernel.dk/io_uring.pdf
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fdeweerdt retweeted
Frank (@jedisct1) profile picture
Frank
@jedisct16 Apr 2019
NNCP is an experiment to build a practical lossless data compressor with neural networks. By Fabrice Bellard. bellard.org/nncp/
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Hi Friends! Pls help make voice dictation software better by doing some “easy beatboxing”. Thanks so much ❤️❤️❤️
Ryan Hileman (@lunixbochs) profile pictureRyan Hileman
@lunixbochs3 Apr 2019
Need your help! Crowdsourcing sounds to train AI. Think easy beatboxing. This will let people with hand disabilities control their computer with just a mic. Takes <30 min to record and you learn fun new sounds. Partial contribution helps. Please share: noise.talonvoice.com
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TIL: Go not only passes all arguments via the stack on x86-64, it passes *return values* via the stack too. 😧
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