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Re:Downfall Attacks by samwillis on Tuesday August 08, 2023 @01:59PM (#37053006)
> some workloads may experience up to 50% overhead

They word there are "some workloads", I suspect that performance hit is rare.

Re:Downfall Attacks by jgtrosh on Tuesday August 08, 2023 @04:24PM (#37054986)
My guess is that HPC systems which run applications whose performance strongly depends on efficient data scatter gather will immediately disable the mitigation.