On Wed, 21 Oct 2020, kernel test robot wrote:
> Greeting,
>
> FYI, we noticed a 87.8% improvement of vm-scalability.throughput due to
> commit:
>
>
> commit: 7fef431be9c9ac255838a9578331567b9dba4477 ("mm/page_alloc: place pages
> to tail in __free_pages_core()")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
>
> in testcase: vm-scalability
> on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz
> with 192G memory
> with following parameters:
>
> runtime: 300s
> size: 512G
> test: anon-wx-rand-mt
> cpufreq_governor: performance
> ucode: 0x5002f01
>
> test-description: The motivation behind this suite is to exercise functions
> and regions of the mm/ of the Linux kernel which are of interest to us.
> test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/
>
I'm curious why we are not able to reproduce this improvement on Skylake
and actually see a slight performance degradation, at least for
300s_128G_truncate_throughput.
Axel Rasmussen <[email protected]> can provide more details on our
results.
