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SubjectRE: [PATCH 06/18] x86, barrier: stop speculation for failed access_ok
Date
From: Linus Torvalds
> Sent: 07 January 2018 19:47
...
> Also, people definitely *are* noticing the performance issues with the
> current set of patches, and they are causing real problems. Go search
> for reports of Amazon AWS slowdowns.

Try over 35% slowdown....
Given that AWS instance runs known code (user and kernel) why do we
need to worry about any of these sideband attacks?

David

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