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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. Dan Kaminsky‏Verified account @dakami 8 Dec 2017
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      So why *aren't* there small bits of compute baked into RAM yet? Referring to highly local operations with fixed dimensionality, or reducing queries (return or update memory region where following constraint is true). We have TB+ EC2 nodes, after all. Why move the data?

      27 replies 24 retweets 132 likes
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    2. whitequark‏ @whitequark 8 Dec 2017
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      Replying to @dakami @mcclure111

      one reason is the wafers that are good for storage (high gate capacitance) suck for computation, and vice versa

      2 replies 0 retweets 13 likes
    3. Hector Martin‏ @marcan42 8 Dec 2017
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      Replying to @whitequark @dakami @mcclure111

      And this is why eDRAM isn't just "copy and paste a RAM design into the die".

      1 reply 0 retweets 2 likes
    4. Dan Kaminsky‏Verified account @dakami 8 Dec 2017
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      Replying to @marcan42 @whitequark @mcclure111

      eDRAM?

      2 replies 0 retweets 0 likes
    5. Ahmad‏ @_sudoreality 9 Dec 2017
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      Replying to @dakami @marcan42 and

      Intel's L4 cache / video RAM. Used on CPUs with Intel Iris graphics. Implemented on a second die sitting next to the CPU+GPU die itself.

      1 reply 0 retweets 1 like
    6. whitequark‏ @whitequark 9 Dec 2017
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      Replying to @_sudoreality @sudoreality and

      to add to this, eDRAM is the name of the concept (z/196 also uses eDRAM, for example), rather than Intel's impl

      1 reply 0 retweets 2 likes
    7. Hector Martin‏ @marcan42 9 Dec 2017
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      Replying to @whitequark @sudoreality and

      Intel's implementation isn't even "real" eDRAM (though by some definitions it qualifies). It's a separate die. I was talking about actually having eDRAM on the same die as logic. That's been common on game consoles since PS2/GameCube, and recently it's used for cache on POWER.

      3 replies 0 retweets 3 likes
    8. whitequark‏ @whitequark 9 Dec 2017
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      Replying to @marcan42 @sudoreality and

      oh, TIL. I thought eDRAM was always different-die.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 9 Dec 2017
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      Replying to @whitequark @sudoreality and

      Yeah, half the Wii U's GPU/SoC die is eDRAM. Two blocks of different density. I think the top left bit is true SRAM. Both that & the smaller eDRAM block used to be eDRAM on Wii/GC, which was also half the die. https://marcan.st/transf/latte_stitched.jpg … https://marcan.st/transf/hollywood_die.jpg … (warning: huge).pic.twitter.com/Mn4FaVn1rL

      1:20 AM - 9 Dec 2017
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      • Ould Mokhtar Youcef Abed Boomba Rohit Singh aroulin
      0 replies 0 retweets 4 likes

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