Ciro S. Costa

@cirowrc

Working on by the day, on the weekend

São Paulo - SP
github.com/cirocosta
Joined May 2009
Born in 1994
290 Photos and videos Photos and videos

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  1. Retweeted
    Aug 13

    TLS 1.3 deployed in Firefox. This is great for the web

    Firefox's official blog post
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    1 reply 9 retweets 34 likes
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  2. Retweeted
    Aug 7

    TLS 1.3 is now powering 50%+ of Facebook's production traffic: - 10% higher throughput and massive latency wins over TLS 1.2. Triple bonus, they also open sourced their implementation! So.. is TLS fast yet? Yes, and it's time to deploy TLS 1.3.

    1 reply 89 retweets 150 likes
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  3. Retweeted
    Jul 31

    ebpf and xdp reference guide by cilium: This is the deepest guide I've seen so far. Highlights: stack is limited to 512 bytes, concrete iproute2 xdp examples, explanation of tail calls.

    24 retweets 75 likes
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  4. Jul 17

    I'm always amazed by how much SVG is useful for annotating stuff (example from here - )

    1 reply 1 retweet 3 likes
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  5. Jul 16

    Regarding the folks going towards encrypted SNI, this is what's proposed (see image).

    1 reply
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  6. Retweeted
    Jul 15

    Awesome work at the IETF 102 hackathon by the encrypted SNI team consisting of folks from and . There are now implementations in BoringSSL, NSS and picotls. Working servers are live at and .

    15 replies 169 retweets 367 likes
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  7. Retweeted
    Jul 11

    This is the best graphic I have ever managed to make

    Clipart salesman standing in front of the front cover of Kernighan and Ritchie's "The C Programming Language", second edition, talking to a customer. Text reads "*slaps roof of C* This bad voy can hold so much undefined behaviour in it"
    28 replies 735 retweets 2,528 likes
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  8. Jul 11

    I used to dislike these MOTDs but I just learned something with it lol

    1 retweet 2 likes
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  9. Jul 10

    What an amazing post - If you've seen your container memory getting up after `git clone`ing something huge (I see you ) and not getting down right away: > "Page cache used by apps is counted towards a cgroup’s memory limit"

    1 retweet 1 like
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  10. Retweeted
    Jul 9

    Recommended Read: How to minify and bundle assets using Hugo -

    1 retweet 1 like
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  11. Jul 7

    Great article by ! Loved the approach of going from userspace and then getting each time earlier in the routing until the point that it does the whole thing in the device itself. XDP is so powerful 👌

    How to drop 10 million packets per second -
    1 like
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  12. Retweeted
    Jul 3

    Fascinating visualisation of how people interpret probabilistic terms

    22 replies 500 retweets 1,272 likes
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  13. Retweeted
    Jul 2

    eBPF autocomplete in vim by , using YouCompleteMe

    1 reply 23 retweets 72 likes
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  14. Apr 9

    Have you seen 's `chrome://histograms`? So many stats over there.

    4 retweets 7 likes
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  15. Retweeted
    Feb 19

    A practical look at basic AWS Networking with Terraform.

    3 replies 9 retweets 38 likes
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  16. Feb 17

    Trends vs. Analytics - feels like there's so much interest being left on the table 🌝

    2 likes
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  17. Retweeted
    Feb 14

    also, a nice hands-on guide on server push+nginx @ — bonus points for chrome://net-internals and Wireshark tips!

    1 reply 16 retweets 64 likes
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  18. Retweeted
    18 Dec 2017

    Buffer will be closed for the last week of 2017. Many are already done for the year. I've been at this 7+ years. At times I've worked over Christmas. It's short-sighted and it creates burnout and debt. It's key that as leaders we encourage rest and mental wellness in our teams.

    Whatever you’re hustling for, take note: most people/companies are shut down until ‘18. That means you get 2 extra weeks to outwork your competition. That’s 3.8% more time. For perspective: Usain Bolt won his gold medals running 1.2% faster. These 2 weeks are a gift. Get to work.
    Show this thread
    60 replies 507 retweets 1,876 likes
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  19. 22 Mar 2017

    Huge! rootless containers almost landing (runc)

    2 likes
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  20. Retweeted
    21 Mar 2017

    New Blog Post! 🎉 Learn how built an IoT using ! 🚀

    12 retweets 14 likes
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