Re: CP15 Barrier emulation performance?
I wouldn't take the message too seriously, just Google it:
https://www.google.com/search?q=%22uses+deprecated+CP15+Barrier+instruction%22&ie=utf-8&oe=utf-8
On 7/5/17, Vagrant Cascadian <vagrant@debian.org> wrote:
> 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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