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donk_enby's profile
crash override
crash override
crash override
@donk_enby

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crash override

@donk_enby

26 • she/her • Mobile RE/Data Spelunking 🌈 Meiklejohnian absolutist. free speech as in free-for-everyone. mutuals: @casloopy

Wien
donk.sh
Joined January 2020

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    1. Hector Martin‏ @marcan42 Jan 4

      Fun fact: of the 1.2GB of Linux kernel source, a whole 200MB and all of the largest files are register bit definitions for AMD Radeon cards. This is because they are auto-generated, and contain bit definitions for every *instance* of every hardware unit, across many generations.pic.twitter.com/M3Vvp6m3iU

      12 replies 178 retweets 857 likes
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    2. Hector Martin‏ @marcan42 Jan 4

      You can tell it's repetitive and information-free, because all 200MB of it xz-compress down to... 3.7MB (1.8%). The rest of the kernel drivers tree (516M) compresses down to 67MB (13%), for comparison. So these files are 30% of the source, but only 5% of the information.

      5 replies 7 retweets 159 likes
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    3. Hector Martin‏ @marcan42 Jan 4

      The amount of information is probably much less, because compression algorithms are good at compressing repetition, but not that good at compressing numeric patterns (e.g. incrementing numbers), which these things are full of.

      1 reply 0 retweets 82 likes
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    4. Hector Martin‏ @marcan42 Jan 4

      This kind of horribleness is common in large companies, yet any sensible engineer would agree it is ridiculous (it serves *no purpose* to have those duplicate defs, and makes this unmaintainable without having the entire generation stack).

      4 replies 1 retweet 96 likes
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    5. Hector Martin‏ @marcan42 Jan 4

      This is why AMD needs hundreds of engineers and a good fraction of them are probably working on drivers, while just a few skilled people can put together working open source reverse engineered GPU drivers. Corporate structures tend to create *massive* overhead and silliness.

      3 replies 14 retweets 154 likes
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    6. Hector Martin‏ @marcan42 Jan 4

      My gut feeling is Apple is leaner in this respect, and gets by with smaller teams, but also overworks them more. We'll see just how sane or not their GPU design is.

      1 reply 1 retweet 80 likes
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    7. Hector Martin‏ @marcan42 Jan 4

      Another reason why AMD needs hundreds of engineers is that AMD's drivers aren't "a driver", they're an entire from-scratch 3D graphics, encoding, decoding, display controller, modesetting, etc stack. Just like Nvidia's. Probably 80% of the code is accomplishing the same tasks.

      2 replies 3 retweets 119 likes
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      crash override‏ @donk_enby Jan 4
      Replying to @marcan42

      What have you been smoking, my dude? This is primarily one guy's work (Marek Olšák). His previous reverse engineered driver was so good, AMD ended up scrapping their proprietary Catalyst driver, hiring him and giving us this.

      6:24 AM - 4 Jan 2021
      • 2 Likes
      • Simon Thoby hikari, Kanbaru enthusiast 🌟 other Andrea
      0 replies 0 retweets 2 likes

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