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> There are also Spectre fixes landing in kernels. E.g. Linux 4.14.14 added initial retpoline support: Which has its own performance drawbacks, but the microco

> There are also Spectre fixes landing in kernels. E.g. Linux 4.14.14 added initial retpoline support: Which has its own performance drawbacks, but the microcode update itself has even more. And you need the microcode update for Broadwell and newer for retpolines to work.

sp332 9y ago
I thought the retpoline basically defeated speculation for certain longjmp/function calls. Why do you need a firmware update for that to work?
- gcbirzan 9y ago
  That subscriber link above explains why, but in the whitepaper I read, it said Broadwell, not only Skylake.