Some of the reproducible builds armhf nodes are actually arm64 capable machines, running an arm64 kernel build. When haskell related packages get built, I get a tremendous number of messages on to the console: "ghc" (13126) uses deprecated CP15 Barrier instruction at 0xefadd224 In the kernel's boot/config-*: CONFIG_CP15_BARRIER_EMULATION=y Does this emulation take a considerable performance hit, as opposed to running on armhf hardware/kernel, where the instruction doesn't appear to be listed as deprecated? Several of the arm64 machines with armhf userland machines seem to perform very poorly... I was wondering if this might somehow be part of the issue. live well, vagrant
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