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Dan Luu
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
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Dan Luu 7. pro
Odgovor korisniku/ci @danluu
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 7. pro
Odgovor korisniku/ci @danluu
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.
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Dan Luu 9. pro
Odgovor korisniku/ci @danluu
BTW, if you want to try CPUID spoofing without virtualization and have a VIA processor, Agner Fog wrote this little utility: Performance delta on benchmarks varies, here's an example of a ~50% gain (47%):
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Perry E. Metzger 8. pro
Odgovor korisniku/ci @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.
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Devdatta Akhawe 8. pro
Odgovor korisniku/ci @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' (appeals court overturned the copyright/trademark violation judgement)
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Travis Downs 7. pro
Odgovor korisniku/ci @danluu
Relevant background and some workarounds (none pleasant):
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Tariq ☕ 8. pro
Odgovor korisniku/ci @danluu @thattommyhall i 2 ostali
really should help itself by helping the 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 8. pro
Odgovor korisniku/ci @danluu
What is that CPU startup? Are there many of those?
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Random832 8. pro
Odgovor korisniku/ci @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)
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