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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. Kia‏☆‏ @alt_kia 23 May 2020
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      w-what happened to my L2 cache on the fourth of Aprilpic.twitter.com/61xL1XnADX

      12 replies 2 retweets 38 likes
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    2. Kia‏☆‏ @alt_kia 23 May 2020
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      the weird thing is that i dont recall seeing any main DRAM ECC errors; kinda worrisome and makes me think that maybe the motherboard/RAM/CPU combination isn't actually doing ECC :/

      4 replies 0 retweets 5 likes
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    3. Hector Martin‏ @marcan42 23 May 2020
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      Replying to @alt_kia

      There's no particular reason why DRAM ECC errors would be correlated. The reporting might be different, e.g. on AMD this goes through EDAC, not MCE, I think. And I'm not even sure if correctable errors are logged as MCEs.

      1 reply 0 retweets 1 like
    4. Kia‏☆‏ @alt_kia 23 May 2020
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      Replying to @marcan42

      i imagined that if there's enough radiation dose to cause cache bits to flip that eventually i'd see a DRAM bit flip ;;

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 23 May 2020
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      Replying to @alt_kia

      Only a small set of angles intersect *both* your CPU *and* your DRAM chips :-) I'm told Google datacenter engineers could trace back the origin of cosmic rays by looking at ~simultaneous DRAM errors and looking at the physical location of those servers...

      2 replies 0 retweets 8 likes
    6. Stephane HLLZI‏ @stephanefr 23 May 2020
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      Replying to @marcan42 @alt_kia

      So the same particule would interact with 2 ram chips ? That looks a bit weird to me...

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 May 2020
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      Replying to @stephanefr @alt_kia

      Very high energy particles have a tendency to keep going in a mostly straight line as they crash into things and spew debris.

      10:43 PM - 23 May 2020
      1 reply 0 retweets 0 likes
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        1. Stephane HLLZI‏ @stephanefr 24 May 2020
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          Replying to @marcan42 @alt_kia

          Exactly, that’s why I doubt about the term “simultaneously“. I don’t think 2 particles could hit 2 ram chips at almost the same time given the fact that they can go through the 🌎 without seeing it. I don’t know if I’m clear ;)

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 24 May 2020
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          Replying to @stephanefr @alt_kia

          You're probably thinking neutrinos, which are another story. Cosmic rays do not go very far into the Earth. A cosmic ray, and the shower of junk it generates in its path, could easily hit multiple chips and cause multiple correlated SEUs.

          1 reply 0 retweets 1 like
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