Re: [LKP] [lkp-robot] [x86/entry/64] 11a1251e3a: hackbench.throughput -12.1% regression

On Jan 2, 2018, at 6:58 PM, kernel test robot <xiaolong.ye(a)intel.com&gt; wrote: Greeting, We noticed a -12.1% regression of hackbench.throughput due to commit: commit: 11a1251e3a3cc9532f358c889deea63169bd2c65 ("x86/entry/64: Make cpu_entry_area.tss read-only") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: hackbench on test machine: 256 threads Phi with 96G memory with following parameters: nr_threads: 100% mode: threads ipc: pipe cpufreq_governor: performance test-description: Hackbench is both a benchmark and a stress test for the Linux kernel scheduler. test-url: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/sc... Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml ========================================================================================= compiler/kconfig/rootfs/sleep/tbox_group/testcase: gcc-7/x86_64-kexec/debian-x86_64-2016-08-31.cgz/1/vm-lkp-wsx03-2G/boot commit: dff71e3c0e ("x86/entry: Clean up the SYSENTER_stack code") 11a1251e3a ("x86/entry/64: Make cpu_entry_area.tss read-only")