On Tue 25-07-17 18:17:54, Kirill A. Shutemov wrote: > > before the patch > > min: 306300.00 max: 6731916.00 avg: 437962.07 std: 92898.30 nr: 100000 > > > > after > > min: 303196.00 max: 5728080.00 avg: 436081.87 std: 96165.98 nr: 100000 > > > > The results are well withing noise as I would expect. > > I've silightly modified your test case: replaced cpuid + rdtsc with > rdtscp. cpuid overhead is measurable in such tight loop. > > 3 runs before the patch: > Min. 1st Qu. Median Mean 3rd Qu. Max. > 177200 205000 212900 217800 223700 2377000 > 172400 201700 209700 214300 220600 1343000 > 175700 203800 212300 217100 223000 1061000 > > 3 runs after the patch: > Min. 1st Qu. Median Mean 3rd Qu. Max. > 175900 204800 213000 216400 223600 1989000 > 180300 210900 219600 223600 230200 3184000 > 182100 212500 222000 226200 232700 1473000 > > The difference is still measuarble. Around 3%.
what is stdev? -- Michal Hocko SUSE Labs
