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@danluu | |||||
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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
pugetsystems.com/labs/hpc/How-T… pic.twitter.com/HRduiSyypU
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Dan Luu
@danluu
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7. pro |
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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.
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Dan Luu
@danluu
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7. pro |
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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.
twitter.com/danluu/status/…
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Dan Luu
@danluu
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9. pro |
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BTW, if you want to try CPUID spoofing without virtualization and have a VIA processor, Agner Fog wrote this little utility:
agner.org/optimize/blog/…
Performance delta on benchmarks varies, here's an example of a ~50% gain (47%):
arstechnica.com/gadgets/2008/0… pic.twitter.com/gLK1cESeRz
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Perry E. Metzger
@perrymetzger
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8. pro |
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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.
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Devdatta Akhawe
@frgx
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8. pro |
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Huh do you have a reference to that ? I had initially thought of the Sega case, where Sega checked for the string 'sega' en.m.wikipedia.org/wiki/Sega_v._A… (appeals court overturned the copyright/trademark violation judgement)
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Travis Downs
@trav_downs
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7. pro |
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Relevant background and some workarounds (none pleasant):
agner.org/optimize/blog/…
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Tariq ☕
@rzeta0
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8. pro |
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@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.
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Hasen Judy
@hasen_judy
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8. pro |
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What is that CPU startup? Are there many of those?
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Random832
@Random832
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8. pro |
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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)
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