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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 18 Dec 2019
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      It got to the title screen, but instead of loading the title screen cinematic behind the logo, it loaded the first map, with a playable Link. You could move around, but the Y axis of the stick was "folded" so you could only ever move backwards, not forwards.

      1 reply 0 retweets 16 likes
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    2. Hector Martin‏ @marcan42 18 Dec 2019
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      So yeah, software damage is far from guaranteed to segfault. This is how you get really odd "undebuggable" problems from memory corruption. And how Intel gets away with still crippling desktop CPUs by disabling ECC RAM support.

      1 reply 7 retweets 40 likes
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    3. Hector Martin‏ @marcan42 18 Dec 2019
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      Your desktop probably flips a few bits in RAM weekly, but you just don't notice. RAM sizes are too huge for memory to be close to 100% reliable. It just isn't possible without error correction support.

      5 replies 8 retweets 46 likes
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    4. Ian Hanschen‏ @furan 18 Dec 2019
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      Replying to @marcan42

      Interesting story, but I don't think this is true.

      2 replies 0 retweets 0 likes
    5. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @furan @marcan42

      "an average of one single-bit-error every 14 to 40 hours per Gigabit of DRAM. The field study also explains that the error-rate increases by the age of the memory. Brand new DRAMs might not show any errors for weeks and months, but then the error-rate suddenly goes up." 1/

      2 replies 0 retweets 2 likes
    6. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @brouhaha @furan @marcan42

      Source,: https://www.intelligentmemory.com/support/faq/ecc-dram/how-often-do-ecc-correctable-single-bit-errors-occur-and-how-about-double-multi-bit-errors.php … 2/

      1 reply 0 retweets 1 like
    7. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @brouhaha @furan @marcan42

      Note that the number is per gigabit, so 8x as much per gigabyte. 3/

      1 reply 0 retweets 2 likes
    8. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @brouhaha @furan @marcan42

      In a typical consumer PC, for a huge percentage of memory at any given time a random but flip can go unnoticed. The probability that such a bit flip will lead to a crash or obvious error in a short time is vanishingly small. 4/

      1 reply 0 retweets 1 like
    9. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @brouhaha @furan @marcan42

      In a non-ECC system, a prompt crash would be the second most desirable outcome of a random memory bit flip. Obviously the most desirable would be for the bit flip to occur in memory that is at that time unused. 5/

      1 reply 0 retweets 2 likes
    10. non-standard nerd, ¬ 🆗‏ @brouhaha 18 Dec 2019
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      Replying to @brouhaha @furan @marcan42

      One of the possible outcomes is that the random bit flip happens in a document you're editing, gets saved to disk, and the error enshrined for the life of the document. It may or may not be noticed at some later date. I've experienced that. 6/

      3 replies 0 retweets 3 likes
      Hector Martin‏ @marcan42 18 Dec 2019
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      Replying to @brouhaha @furan

      I noticed my first bad RAM bit (back in the Athlon64 days) because I got a syntax error in a system Perl module, as the page cache landed on the bad bit. It didn't persist though, as it wasn't dirtied. I masked off the bad chunk of RAM with a kernel patch and kept using it.

      10:27 PM - 18 Dec 2019
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      • Natanael, tech janitor ゆっくりヤンキーと言うグレェ「grey」、どうぞよろしくお願いします。 Ian Hanschen
      0 replies 0 retweets 3 likes

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