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Spectre v1 + SWAPGSZombieload and TSX Asynchronous Abort
The mitigations for the original v1 bounds check bypasses can’t be disabled, however I still disabled the SWAPGS mitigations using the nospectre_v1 kernel parameter. In my testing, disabling the SWAPGS barriers resulted in a small (1-2%) performance increase.
Spectre v2
I disabled the Spectre v2 mitigations using the nospectre_v2 kernel parameter. The performance impact was significant, around 15-20%.
Spectre v3/Meltdown
I disabled KPTI using the pti=off kernel parameter. This resulted in a performance increase of around 6%.
MDS
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