On 04/01/2018 22:22, Van De Ven, Arjan wrote: > this is about a level of paranoia you are comfortable with. > > Retpoline on Skylake raises the bar for the issue enormously, but > there are a set of corner cases that exist and that are not trivial > to prove you dealt with them. > > personally I am comfortable with retpoline on Skylake, but I would > like to have IBRS as an opt in for the paranoid. >
IBRS actually seems to perform more than decently on Skylake with the microcode updates we're shipping in RHEL---much more so than Broadwell or Haswell. Can you confirm that this is expected? Paolo
