You could use http://CR0.CD (bit 30) do do the same thing. Keep in mind that both, MSR and control register are core-local so you need to do it on all cores to be really slow ;)
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...another option would be to remap caching via IA32_PAT so WB becomes UC
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That’s actually great idea for ransomware ;)
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cash4cache
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or use a java program with so much indirection the cache gives up
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In the late '90s, we had a dual-CPU motherboard where the BIOS set up the first CPU correctly, but left the cache off on the second CPU. The performance impact as processes switched between CPUs was ... striking...
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4GHz 286...
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