Testing the new retpoline mitigation on AMD for Spectre v2 shows that the performance loss with the new patch is nowhere nearly as big as the performance impact incurred by Intel processors.
Spectre-bhb RSS
Intel and ARM are vulnerable to the Spectre-BHB flaw, but AMD is apparently troubled by Spectre v2, which it should have fixed back in 2018. AMD has now issued a new fix for the CVE-2017-5715 bug.
A new CPU exploit based on the infamous Spectre v2 has been discovered. However, when the security patch is applied it can affect performance by up to 36%, that's according to a recent study.
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