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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. Solar Designer‏ @solardiz 7 Jul 2017
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      Are there any cycle-accurate or -reporting modern x86(-64)+SIMD emulators (thus, for specific microarchs) beside https://software.intel.com/en-us/articles/intel-architecture-code-analyzer …?

      5 replies 14 retweets 30 likes
    2. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @solardiz @matthew_d_green

      Are modern x86 systems cycle accurate in any predictable sense?

      2 replies 1 retweet 3 likes
    3. Hector Martin‏ @marcan42 8 Jul 2017
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      Replying to @dakami @solardiz @matthew_d_green

      Given all the clock domains I'm not so sure...

      1 reply 0 retweets 0 likes
    4. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @marcan42 @solardiz @matthew_d_green

      Are there multiple clocks inside Intel now?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 8 Jul 2017
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      Replying to @dakami @solardiz @matthew_d_green

      Don't they have separate clocks for uncore, cores, caches, memory controller, etc these days?

      1 reply 0 retweets 0 likes
    6. George Brown‏ @georgeb_ 8 Jul 2017
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      Replying to @marcan42 @dakami and

      Uncore has been spectate from core since Haswell I think. Not certain on other components.

      1 reply 0 retweets 0 likes
    7. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @georgeb_ @marcan42 and

      How separate? Literally independent crystals, asynchronously bound?

      3 replies 0 retweets 0 likes
    8. e. v. m.‏ @evm_sec 8 Jul 2017
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      Replying to @dakami @georgeb_ and

      Every Intel CPU since Pentium days uses 1 crystal which is multiplied up by a clock chip that Intel specifies, gives the bus & cpu clks

      1 reply 0 retweets 0 likes
    9. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @evm_sec @georgeb_ and

      integer multipliers of the same clock are, unfortunately, not what I'm looking for :\

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 8 Jul 2017
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      Replying to @dakami @evm_sec and

      It's probably *possible* to extract entropy out of clock phasing, but *depending* on it would be a lot more difficult.

      1:31 PM - 8 Jul 2017
      1 reply 0 retweets 0 likes
        1. Hector Martin‏ @marcan42 8 Jul 2017
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          Replying to @marcan42 @dakami and

          E.g. you can configure a DLL to be "loose" enough that it drifts quite a lot. Also, clocks are often spread spectrum.

          0 replies 0 retweets 0 likes
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