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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. whitequark‏ @whitequark 10 Apr 2018
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      did you know that DDR4 timings are intimately dependent on temperature (there is a temperature probe inside the modules). for example, the hotter the RAM is, the faster it gets refreshed by the controllerpic.twitter.com/4KpjIwsHTz

      11 replies 85 retweets 248 likes
      Show this thread
    2. Hector Martin‏ @marcan42 10 Apr 2018
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      Replying to @whitequark

      Not just that, it also needs periodic runtime retraining. Which on Tegra210 is done... by the Linux kernel, because they were too lazy to implement it on the BPMP CPU. Guess which feature isn't upstreamed yet, totally killing performance since the RAM runs at safe boot timings?

      4 replies 9 retweets 43 likes
    3. olddellian‏ @olddellian 10 Apr 2018
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      Replying to @marcan42 @whitequark

      What does this sort of runtime retraining on #OpenPOWER? The OCC? @stewartsmith, @RaptorEng, @adi_gangidi do any of you know?

      2 replies 0 retweets 1 like
    4. Stewart Smith‏ @stewartsmith 10 Apr 2018
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      Replying to @olddellian @marcan42 and

      No idea. I'd guess it's in the memory controller? It's not in OPAL or Linux at least.

      1 reply 0 retweets 1 like
    5. J‏ @justinrwlynn 10 Apr 2018
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      Replying to @stewartsmith @olddellian and

      Is memory controller documentation, at that level, generally available

      1 reply 0 retweets 1 like
    6. Stewart Smith‏ @stewartsmith 10 Apr 2018
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      Replying to @justinrwlynn @olddellian and

      I'd start by looking at the sources in hostboot on how they're set up. I'm actually not entirely sure where I'd find any deeper docs internally let alone externally :)

      1 reply 0 retweets 2 likes
    7. J‏ @justinrwlynn 10 Apr 2018
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      Replying to @stewartsmith @olddellian and

      *ponders*

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 10 Apr 2018
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      Replying to @justinrwlynn @stewartsmith and

      I'd be curious to find out; memory training voodoo is always interesting. Also, what I mention applies to mobile/LPDDR4. I'm not sure if the rules for regular DDR4 are different.

      11:18 PM - 10 Apr 2018
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