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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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    Dan Luu‏ @danluu 7 Dec 2019
    • Report Tweet

    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 ...
    3:05 PM - 7 Dec 2019
    • 318 Retweets
    • 797 Likes
    • Your Perfect Call Can Not Be Quid Pro as Quo’ed Johnny Bo Tian John Garfield atechiethought NessDan (The Keyboard Smash Player) Thomas Phillips Xavier BEAUDOUIN 奇伟 Graham Sutherland [Polynomial^DSS]
    11 replies 318 retweets 797 likes
      1. New conversation
      2. Dan Luu‏ @danluu 7 Dec 2019
        • Report Tweet

        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.

        2 replies 15 retweets 81 likes
        Show this thread
      3. Dan Luu‏ @danluu 7 Dec 2019
        • Report Tweet

        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 37 retweets 166 likes
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      4. Dan Luu‏ @danluu 8 Dec 2019
        • Report Tweet

        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 8 retweets 29 likes
        Show this thread
      5. End of conversation
      1. New conversation
      2. Perry E. Metzger‏ @perrymetzger 8 Dec 2019
        • Report Tweet
        Replying to @danluu

        It would not be a copyright violation. There was a precedent about 35 years ago from TI suing a manufacturer of cartridges for their 99/4a computers, which would only work if a special string was in the ROM. TI lost, because the string was functional and not creative.

        1 reply 0 retweets 25 likes
      3. Devdatta Akhawe‏ @frgx 8 Dec 2019
        • Report Tweet
        Replying to @perrymetzger @danluu

        Huh do you have a reference to that ? I had initially thought of the Sega case, where Sega checked for the string 'sega' https://en.m.wikipedia.org/wiki/Sega_v._Accolade … (appeals court overturned the copyright/trademark violation judgement)

        1 reply 0 retweets 4 likes
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      2. Travis Downs‏ @trav_downs 7 Dec 2019
        • Report Tweet
        Replying to @danluu

        Relevant background and some workarounds (none pleasant): https://www.agner.org/optimize/blog/read.php?i=49 …

        1 reply 4 retweets 48 likes
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      1. Tariq  ☕‏ @rzeta0 7 Dec 2019
        • Report Tweet
        Replying to @danluu @thattommyhall

        @amd really should help itself by helping the @anacondainc group to take advantage of AMD CPUs. I recently made a purchasing decision to Intel and the major factor was Python/bumpy/MKL which is most of my work.

        0 replies 1 retweet 15 likes
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      1. Hasen Judy‏ @hasen_judy 8 Dec 2019
        • Report Tweet
        Replying to @danluu

        What is that CPU startup? Are there many of those?

        0 replies 0 retweets 2 likes
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      1. Random832‏ @Random832 8 Dec 2019
        • Report Tweet
        Replying to @danluu

        What about Sega v. Accolade? (probably safer to let the user change it anyway, but this seems like a similar kind of thing - I'm not a lawyer though)

        0 replies 0 retweets 1 like
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