[Perf] Changes at 6/21/2022 11:38:18 AM

[performanceautofiler]

Run Information

Architecture	arm64
OS	Windows 10.0.19041
Baseline	715c71ae6af5775402e54d3b8ab6c4a888da3cb5
Compare	d24bf0991d02ab07b93b71edfed8634de818060c
Diff	Diff

Regressions in Microsoft.AspNetCore.Server.Kestrel.Performance.PipeThroughputBenchmark

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Parse_ParallelAsync - Duration of single invocation	1.23 μs	1.40 μs	1.13	0.47	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'Microsoft.AspNetCore.Server.Kestrel.Performance.PipeThroughputBenchmark*'

Payloads

Baseline
Compare

Histogram

Microsoft.AspNetCore.Server.Kestrel.Performance.PipeThroughputBenchmark.Parse_ParallelAsync(Length: 128, Chunks: 16)

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 1.3996482136461321 > 1.2808492813617591.
IsChangePoint: Marked as a change because one of 5/9/2022 6:32:22 AM, 6/21/2022 3:41:14 AM, 6/23/2022 3:07:42 AM falls between 6/14/2022 10:05:19 AM and 6/23/2022 3:07:42 AM.
IsRegressionStdDev: Marked as regression because -3.563805949287773 (T) = (0 -1489.2043901314894) / Math.Sqrt((7008.797006878841 / (39)) + (36785.314562944324 / (7))) is less than -2.0153675744421933 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (39) + (7) - 2, .025) and -0.2142123340715675 = (1226.4777323895257 - 1489.2043901314894) / 1226.4777323895257 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[EgorBo]

The only suspect is dotnet/runtime#70921 (e.g. atomics are slower on "little" cores)