Comment by wscott
9 years ago
Has anyone benchmarked one of these machines before and after applying this microcode update? The options in microcode are rather limited and all are likely to have performance impacts. This is likely disabling functionally to avoid this case. I would hope the patch is smart enough to not apply if threading is not enabled, but who knows.
Would a performance hit go unnoticed?
Usually (always?) it's not a ROM update, the encrypted microcode blob is loaded into the CPU by the OS on every boot via CONFIG_MICROCODE.
some linkrot: http://imgur.com/a/z1uLv