dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 8 Regressions on 2/26/2026 3:05:48 PM +00:00

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arch-x86 branch-refs/heads/main kind-micro os-windows perf-regression runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [e5dde0cb50d5827d38008f414a35e9a54c65ac0e](https://github.com/dotnet/runtime/commit/e5dde0cb50d5827d38008f414a35e9a54c65ac0e)
Compare | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e5dde0cb50d5827d38008f414a35e9a54c65ac0e...371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Serialization.Tests.WriteJson<BinaryData>

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

  • [SerializeToStream - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 215.69 ns | 245.23 ns | 1.14 | 0.26 | False | | |
|
  • [SerializeObjectProperty - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 342.22 ns | 376.92 ns | 1.10 | 0.06 | False | | |
|
  • [SerializeObjectProperty - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 348.58 ns | 390.55 ns | 1.12 | 0.11 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Serialization.Tests.WriteJson*'
```

### System.Text.Json.Serialization.Tests.WriteJson<BinaryData>.SerializeToStream(Mode: Reflection)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Serialization.Tests.WriteJson<BinaryData>.SerializeObjectProperty(Mode: SourceGen)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Serialization.Tests.WriteJson<BinaryData>.SerializeObjectProperty(Mode: Reflection)

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [d63c175469bcaa3f3d5bc73aa6fd108bbf00797b](https://github.com/dotnet/runtime/commit/d63c175469bcaa3f3d5bc73aa6fd108bbf00797b)
Compare | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d63c175469bcaa3f3d5bc73aa6fd108bbf00797b...371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Reflection.Attributes

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

  • [GetCustomAttributesClassMiss - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 71.46 ns | 75.38 ns | 1.05 | 0.15 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Reflection.Attributes*'
```

### System.Reflection.Attributes.GetCustomAttributesClassMiss

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [133c7bde3fb7dd914f423ffb3e408cc61787e0bb](https://github.com/dotnet/runtime/commit/133c7bde3fb7dd914f423ffb3e408cc61787e0bb)
Compare | [de761a5e0a7bd363b5eb119260acfc8da4e9608c](https://github.com/dotnet/runtime/commit/de761a5e0a7bd363b5eb119260acfc8da4e9608c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/133c7bde3fb7dd914f423ffb3e408cc61787e0bb...de761a5e0a7bd363b5eb119260acfc8da4e9608c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.Perf_LengthBucketsFrozenDictionary

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

  • [ToFrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 184.51 ns | 229.06 ns | 1.24 | 0.37 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.Perf_LengthBucketsFrozenDictionary*'
```

### System.Collections.Perf_LengthBucketsFrozenDictionary.ToFrozenDictionary(Count: 10, ItemsPerBucket: 1)

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [e5dde0cb50d5827d38008f414a35e9a54c65ac0e](https://github.com/dotnet/runtime/commit/e5dde0cb50d5827d38008f414a35e9a54c65ac0e)
Compare | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e5dde0cb50d5827d38008f414a35e9a54c65ac0e...371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [SortedList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.76 μs | 7.79 μs | 1.15 | 0.33 | False | | |
|
  • [SortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 12.23 μs | 33.56 μs | 2.75 | 0.10 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.IndexerSet*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IndexerSet<Int32>.SortedDictionary(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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [133c7bde3fb7dd914f423ffb3e408cc61787e0bb](https://github.com/dotnet/runtime/commit/133c7bde3fb7dd914f423ffb3e408cc61787e0bb)
Compare | [de761a5e0a7bd363b5eb119260acfc8da4e9608c](https://github.com/dotnet/runtime/commit/de761a5e0a7bd363b5eb119260acfc8da4e9608c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/133c7bde3fb7dd914f423ffb3e408cc61787e0bb...de761a5e0a7bd363b5eb119260acfc8da4e9608c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Serialization.Tests.ReadJson<Hashtable>

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

  • [DeserializeFromUtf8Bytes - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.85 μs | 22.86 μs | 1.10 | 0.22 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Serialization.Tests.ReadJson*'
```

### System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromUtf8Bytes(Mode: Reflection)

#### 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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