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 <axelrasmus...@google.com> can provide more details on our results.