Hello "kernel robot" team, First of all, thank you very much for running these tests against the linux kernel. I am trying to reproduce this report, and I would appreciate some help to understand what is being measured, and try to reproduce the reported problem. On Fri, Dec 27, 2024 at 11:10:11AM +0800, kernel test robot wrote: > kernel test robot noticed a 98.9% regression of stress-ng.syscall.ops_per_sec on: Is this metric coming from `bogo ops/s` from stress-ng? I am trying to reproduce this problem, running the following script: https://download.01.org/0day-ci/archive/20241227/202412271017.cad7675-lkp@xxxxxxxxx/repro-script And I see the output like the one below, but, it is unclear to me what metric regressed stress-ng.syscall.ops_per_sec means exactly. Would you mind helping me to understand what is stress-ng.syscall.ops_per_sec and how it maps to stress-ng metrics? Output of `stress-ng --timeout 60 --times --verify --metrics --no-rand-seed --syscall 224`: stress-ng: info: [59621] setting to a 1 min, 0 secs run per stressor stress-ng: info: [59621] dispatching hogs: 224 syscall stress-ng: info: [59647] syscall: using method 'fast75' stress-ng: info: [59647] syscall: 292 system call tests, 219 (75.0%) fastest non-failing tests fully exercised stress-ng: info: [59647] syscall: Top 10 fastest system calls (timings in nanosecs): stress-ng: info: [59647] syscall: System Call Avg (ns) Min (ns) Max (ns) stress-ng: info: [59647] syscall: pkey_get 156.0 127 185 stress-ng: info: [59647] syscall: time 212.5 195 230 stress-ng: info: [59647] syscall: pkey_set 235.5 193 278 stress-ng: info: [59647] syscall: gettimeofday 282.5 255 310 stress-ng: info: [59647] syscall: getcpu 457.0 388 526 stress-ng: info: [59647] syscall: set_robust_list 791.5 745 838 stress-ng: info: [59647] syscall: getgid 1137.0 974 1300 stress-ng: info: [59647] syscall: setresuid 1146.0 1070 1222 stress-ng: info: [59647] syscall: getuid 1162.5 902 1423 stress-ng: info: [59647] syscall: setresgid 1211.5 1159 1264 stress-ng: metrc: [59621] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s CPU used per RSS Max stress-ng: metrc: [59621] (secs) (secs) (secs) (real time) (usr+sys time) instance (%) (KB) stress-ng: metrc: [59621] syscall 114464 86.78 1.27 364.05 1318.95 313.33 1.88 4500 stress-ng: info: [59621] for a 98.30s run time: stress-ng: info: [59621] 3538.93s available CPU time stress-ng: info: [59621] 1.26s user time ( 0.04%) stress-ng: info: [59621] 366.66s system time ( 10.36%) stress-ng: info: [59621] 367.92s total time ( 10.40%) stress-ng: info: [59621] load average: 80.45 43.94 20.82 stress-ng: info: [59621] skipped: 0 stress-ng: info: [59621] passed: 224: syscall (224) stress-ng: info: [59621] failed: 0 stress-ng: info: [59621] metrics untrustworthy: 0 stress-ng: info: [59621] successful run completed in 1 min, 38.30 secs Thank you! --breno
