dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 9 Regressions on 2/20/2026 1:59:31 PM +00:00

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ampere arch-arm64 branch-refs/heads/main kind-micro os-linux perf-regression runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f8ac08f32b25431ca53e38ea45a5a78128c978e3](https://github.com/dotnet/runtime/commit/f8ac08f32b25431ca53e38ea45a5a78128c978e3)
Compare | [127fe2d9e792b2fa4885a933348a8bf18bf16a34](https://github.com/dotnet/runtime/commit/127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f8ac08f32b25431ca53e38ea45a5a78128c978e3...127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.IndexerSet<Int32>

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [ConcurrentDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.95 μs | 17.50 μs | 1.10 | 0.08 | False | | |

![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.IndexerSet*'
```

### System.Collections.IndexerSet<Int32>.ConcurrentDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

---

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f8ac08f32b25431ca53e38ea45a5a78128c978e3](https://github.com/dotnet/runtime/commit/f8ac08f32b25431ca53e38ea45a5a78128c978e3)
Compare | [127fe2d9e792b2fa4885a933348a8bf18bf16a34](https://github.com/dotnet/runtime/commit/127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f8ac08f32b25431ca53e38ea45a5a78128c978e3...127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.CtorDefaultSize<Int32>

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [HashSet - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.79 ns | 8.53 ns | 1.47 | 0.50 | False | | |
|
  • [Dictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.88 ns | 8.18 ns | 1.19 | 0.46 | False | | |
|
  • [ConcurrentQueue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 98.63 ns | 115.38 ns | 1.17 | 0.37 | False | | |
|
  • [List - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.85 ns | 5.80 ns | 1.51 | 0.56 | False | | |
|
  • [Queue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.65 ns | 7.30 ns | 1.57 | 0.52 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CtorDefaultSize*'
```

### System.Collections.CtorDefaultSize<Int32>.HashSet

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.Dictionary

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.ConcurrentQueue

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.List

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.Queue

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

---

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f8ac08f32b25431ca53e38ea45a5a78128c978e3](https://github.com/dotnet/runtime/commit/f8ac08f32b25431ca53e38ea45a5a78128c978e3)
Compare | [127fe2d9e792b2fa4885a933348a8bf18bf16a34](https://github.com/dotnet/runtime/commit/127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f8ac08f32b25431ca53e38ea45a5a78128c978e3...127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in Microsoft.Extensions.DependencyInjection.ScopeValidation

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [TransientWithScopeValidation - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 30.20 ns | 34.73 ns | 1.15 | 0.31 | False | | |
|
  • [Transient - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.34 ns | 20.93 ns | 1.21 | 0.41 | False | | |

![graph]()
![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Microsoft.Extensions.DependencyInjection.ScopeValidation*'
```

### Microsoft.Extensions.DependencyInjection.ScopeValidation.TransientWithScopeValidation

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.DependencyInjection.ScopeValidation.Transient

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

---

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f8ac08f32b25431ca53e38ea45a5a78128c978e3](https://github.com/dotnet/runtime/commit/f8ac08f32b25431ca53e38ea45a5a78128c978e3)
Compare | [127fe2d9e792b2fa4885a933348a8bf18bf16a34](https://github.com/dotnet/runtime/commit/127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f8ac08f32b25431ca53e38ea45a5a78128c978e3...127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Tests.Perf_GC<Byte>

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [AllocateArray - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 85.30 ns | 97.38 ns | 1.14 | 0.20 | False | | |

![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_GC*'
```

### System.Tests.Perf_GC<Byte>.AllocateArray(length: 1000, pinned: False)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

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