On Wed, Feb 14, 2018 at 06:05:01PM -0500, Jan Stancek wrote:
> Hi,
>
> mallocstress[1] LTP testcase takes ~5+ minutes to complete
> on some arm64 systems (e.g. 4 node, 64 CPU, 256GB RAM):
> real 7m58.089s
> user 0m0.513s
> sys 24m27.041s
>
> But if I turn off THP ("transparent_hugepage=never") it's a lot faster:
> real 0m4.185s
> user 0m0.298s
> sys 0m13.954s
>
It's multi-threaded workload. My *guess* is that poor performance is due
to lack of ARCH_ENABLE_SPLIT_PMD_PTLOCK support on arm64.
--
Kirill A. Shutemov
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