Re: CP15 Barrier emulation performance?

[Edmund Grimley Evans <edmund.grimley.evans@gmail.com>]

> 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?

I'd expect the kernel-emulated instruction to be much slower than any
non-emulated instruction, but the overall effect on performance will,
of course, depend on how often the instruction is used.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864847 (where I
think I claimed that the instruction is deprecated on armhf hardware
but I could easily be wrong)