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SubjectRe: [rfc][patch 2/3] x86: fix IO write barriers

> The only vendor that ever implemented OOSTOREs was Centaur, and they
> only did in the Winchip generation of the CPUs. When they dropped it
> from the C3, I asked whether they intended to bring it back, and the
> answer was "extremely unlikely".

Do you know if it made a big performance difference?

But yes we should probably just remove this special case to make
maintenance easier.

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