dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 19 Regressions on 6/12/2026 2:03:56 AM +00:00

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arch-x86 branch-refs/heads/main compilationmode-tiered kind-micro Look Again os-windows perf-regression runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Memory.Span<Int32>

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

  • [IndexOfAnyFourValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.93 μs | 2.77 μs | 1.43 | 0.24 | False | | |
|
  • [IndexOfAnyFourValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 22.48 ns | 29.82 ns | 1.33 | 0.40 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.43 μs | 2.85 μs | 1.18 | 0.17 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 419.61 ns | 490.84 ns | 1.17 | 0.15 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.10 ns | 31.37 ns | 1.16 | 0.15 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span*'
```

### System.Memory.Span<Int32>.IndexOfAnyFourValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFourValues(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 33)

#### 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 | [f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd](https://github.com/dotnet/runtime/commit/f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.Perf_RandomAccess

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

  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 100.17 ms | 146.93 ms | 1.47 | 0.58 | False | | |
|
  • [ReadScatterAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.15 ms | 4.52 ms | 1.43 | 0.50 | False | | |
|
  • [WriteGatherAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.58 ms | 5.01 ms | 1.40 | 0.54 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 120.12 ms | 165.35 ms | 1.38 | 0.54 | False | | |
|
  • [ReadScatterAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 34.32 ms | 40.30 ms | 1.17 | 0.28 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_RandomAccess*'
```

### System.IO.Tests.Perf_RandomAccess.ReadAsync(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.ReadScatterAsync(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.WriteGatherAsync(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.WriteAsync(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.ReadScatterAsync(fileSize: 104857600, buffersSize: 65536, options: None)

#### 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 | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.Perf_FileStream

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

  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 350.43 ms | 544.54 ms | 1.55 | 0.54 | False | | |
|
  • [WriteAsync_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1.50 ms | 1.98 ms | 1.32 | 0.43 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.51 ms | 5.76 ms | 1.28 | 0.58 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 104857600, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering_PreallocationSize(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

#### 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 | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Net.Http.Tests.SocketsHttpHandlerPerfTest

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

  • [Get - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 36.17 μs | 54.10 μs | 1.50 | 0.53 | False | | |
|
  • [Get - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 42.60 μs | 55.01 μs | 1.29 | 0.40 | False | | |
|
  • [Get - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 36.06 μs | 46.26 μs | 1.28 | 0.53 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Net.Http.Tests.SocketsHttpHandlerPerfTest*'
```

### System.Net.Http.Tests.SocketsHttpHandlerPerfTest.Get(ssl: False, chunkedResponse: True, responseLength: 1)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Http.Tests.SocketsHttpHandlerPerfTest.Get(ssl: True, chunkedResponse: False, responseLength: 1)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Http.Tests.SocketsHttpHandlerPerfTest.Get(ssl: False, chunkedResponse: False, responseLength: 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 | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.Perf_File

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

  • [ReadAllBytesAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 29.37 μs | 39.02 μs | 1.33 | 0.55 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_File*'
```

### System.IO.Tests.Perf_File.ReadAllBytesAsync(size: 16384)

#### 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 | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>

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

  • [Add_Vector - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.84 ns | 31.23 ns | 1.12 | 0.55 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.Add_Vector(BufferLength: 128)

#### 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 | [e563422012f994091f0f1d52deeed8c6273edecb](https://github.com/dotnet/runtime/commit/e563422012f994091f0f1d52deeed8c6273edecb)
Compare | [4c74f6ac0db2db2326798751e773f8c0c2a7aac9](https://github.com/dotnet/runtime/commit/4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e563422012f994091f0f1d52deeed8c6273edecb...4c74f6ac0db2db2326798751e773f8c0c2a7aac9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Net.Sockets.Tests.SocketSendReceivePerfTest

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

  • [ReceiveAsyncThenSendAsync_Task - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 162.86 ms | 232.44 ms | 1.43 | 0.62 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Net.Sockets.Tests.SocketSendReceivePerfTest*'
```

### System.Net.Sockets.Tests.SocketSendReceivePerfTest.ReceiveAsyncThenSendAsync_Task

#### 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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