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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    1. Dan Luu‏ @danluu 7 Dec 2019
      • Report Tweet
      • Report NetzDG Violation

      This kind of thing is why the CPU startup I worked for allowed users to change the CPUID: you get huge performance gains from putting GenuineIntel in CPUID(0), but it would be a copyright violation to distribute our CPU with GenuineIntel in the CPUID https://www.pugetsystems.com/labs/hpc/How-To-Use-MKL-with-AMD-Ryzen-and-Threadripper-CPU-s-Effectively-for-Python-Numpy-And-Other-Applications-1637/ …pic.twitter.com/HRduiSyypU

      ... The short story is that Intel checks for "Genuine Intel" CPU's when it's numerical library MKL starts executing code. If it find an Intel CPU then it will follow an optimal code path for maximum performance on hardware. If it finds and AMD processor is takes a code path that only optimizes to the old (ancient) SSE2 instruction level ...
      11 replies 312 retweets 790 likes
      Show this thread
      Dan Luu‏ @danluu 7 Dec 2019
      • Report Tweet
      • Report NetzDG Violation

      That post blames Intel, but it's not just them. NaCl forcibly crashed (and Google refused our trivial fix!!!), random drivers wouldn't work, you had to get a patched Windows installer for multiple releases of Windows (difficult in the days of CD installers), etc.

      3:11 PM - 7 Dec 2019
      • 14 Retweets
      • 81 Likes
      • Kai Malte Esders Bastian :) Parash Thapalia LucidBrot Manuel Gómez edugol 🚂📌 vladdy Ryan MacLean 🍩
      2 replies 14 retweets 81 likes
        1. New conversation
        2. Dan Luu‏ @danluu 7 Dec 2019
          • Report Tweet
          • Report NetzDG Violation

          Dan Luu Retweeted Dan Luu

          The Google Chromium team banning our CPUs is especially ironic in retrospect since they cited security concerns. At the time, we were mostly shipping in-order CPUs, not vulnerable to Metldown/Spectre/etc. and of course Intel is the most vulnerable these.https://twitter.com/danluu/status/779746231287328768 …

          Dan Luu added,

          Dan Luu @danluu
          Five year anniversary of the bug where Google refuses to allow NaCl to run on non-mainstream CPUs coming up! https://bugs.chromium.org/p/nativeclient/issues/detail?id=2508 … pic.twitter.com/vtXWr3j3QZ
          5 replies 34 retweets 165 likes
          Show this thread
        3. Dan Luu‏ @danluu 8 Dec 2019
          • Report Tweet
          • Report NetzDG Violation

          BTW, if you want to try CPUID spoofing without virtualization and have a VIA processor, Agner Fog wrote this little utility: https://www.agner.org/optimize/blog/read.php?i=118#73 … Performance delta on benchmarks varies, here's an example of a ~50% gain (47%): https://arstechnica.com/gadgets/2008/07/atom-nano-review/6/ …pic.twitter.com/gLK1cESeRz

          Score with normal CPUID: 1845
Scored with spoofed CPUID: 2721

(higher is better)
          0 replies 7 retweets 28 likes
          Show this thread
        4. End of conversation

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