dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 10 Regressions on 4/27/2026 9:54:26 AM +00:00

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arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro os-linux perf-regression runkind-micro runtimetype-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Compare | [aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a](https://github.com/dotnet/runtime/commit/aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5ef1257b9b3042bd577bc93003bac71432830fbb...aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

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

  • [Ctor_String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 75.72 ns | 97.02 ns | 1.28 | 0.54 | False | | |
|
  • [EndsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 909.36 ns | 1121.73 ns | 1.23 | 0.28 | False | | |
|
  • [IndexOf - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.28 μs | 1.54 μs | 1.21 | 0.34 | False | | |
|
  • [SubString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.18 μs | 1.35 μs | 1.15 | 0.24 | False | | |
|
  • [LastIndexOf - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 851.56 ns | 966.81 ns | 1.14 | 0.26 | False | | |
|
  • [Equals_String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.72 μs | 1.86 μs | 1.08 | 0.28 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.03 μs | 1.10 μs | 1.06 | 0.27 | False | | |

![graph]()
![graph]()
![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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*'
```

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Ctor_String

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.EndsWith

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.IndexOf

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.SubString

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.LastIndexOf

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_String

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.StartsWith

#### 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 | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Compare | [aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a](https://github.com/dotnet/runtime/commit/aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5ef1257b9b3042bd577bc93003bac71432830fbb...aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Net.Tests.Perf_WebUtility

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

  • [HtmlDecode_Entities - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 41.36 μs | 50.69 μs | 1.23 | 0.31 | False | | |
|
  • [Decode_DecodingRequired - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.02 μs | 9.59 μs | 1.06 | 0.29 | 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 'System.Net.Tests.Perf_WebUtility*'
```

### System.Net.Tests.Perf_WebUtility.HtmlDecode_Entities

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Tests.Perf_WebUtility.Decode_DecodingRequired

#### 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 | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Compare | [aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a](https://github.com/dotnet/runtime/commit/aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5ef1257b9b3042bd577bc93003bac71432830fbb...aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Memory.Constructors<String>

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

  • [ReadOnlySpanFromArrayStartLength - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 137.29 ns | 156.44 ns | 1.14 | 0.43 | 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.Memory.Constructors*'
```

### System.Memory.Constructors<String>.ReadOnlySpanFromArrayStartLength

#### 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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