dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 20 Regressions on 5/19/2026 10:41:37 PM +00:00

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arch-arm64 bdn-update branch-refs/heads/main compilationmode-tiered kind-micro os-linux perf-regression runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [907596760ed73c4025395ee502ea7b3c1d285d9e](https://github.com/dotnet/runtime/commit/907596760ed73c4025395ee502ea7b3c1d285d9e)
Compare | [99f87de9b1deedd54f89389ffdbddaa709d5d18e](https://github.com/dotnet/runtime/commit/99f87de9b1deedd54f89389ffdbddaa709d5d18e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/907596760ed73c4025395ee502ea7b3c1d285d9e...99f87de9b1deedd54f89389ffdbddaa709d5d18e)
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]()
| 46.56 ms | 218.60 ms | 4.70 | 0.38 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 813.64 μs | 3801.94 μs | 4.67 | 0.77 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.86 ms | 77.79 ms | 4.12 | 0.59 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 658.14 μs | 2540.24 μs | 3.86 | 0.77 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 480.08 μs | 1820.36 μs | 3.79 | 0.71 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 218.52 μs | 826.22 μs | 3.78 | 0.76 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 983.24 μs | 3431.72 μs | 3.49 | 0.74 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 225.71 μs | 739.86 μs | 3.28 | 0.76 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 25.86 ms | 78.50 ms | 3.04 | 0.74 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 43.89 ms | 128.27 ms | 2.92 | 0.39 | False | | |
|
  • [AppendAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.26 ms | 3.52 ms | 2.80 | 0.82 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.75 ms | 4.22 ms | 2.41 | 0.77 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.26 μs | 36.90 μs | 1.92 | 0.77 | False | | |
|
  • [WriteAsync_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 80.99 ms | 148.71 ms | 1.84 | 0.64 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 217.26 ms | 392.35 ms | 1.81 | 0.81 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.83 ms | 4.72 ms | 1.67 | 0.88 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 257.90 ms | 398.25 ms | 1.54 | 0.83 | False | | |
|
  • [WriteAsync_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1.07 ms | 1.59 ms | 1.48 | 0.61 | False | | |

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[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: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1024, userBufferSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering_PreallocationSize(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 104857600, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(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

### 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 | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [907596760ed73c4025395ee502ea7b3c1d285d9e](https://github.com/dotnet/runtime/commit/907596760ed73c4025395ee502ea7b3c1d285d9e)
Compare | [99f87de9b1deedd54f89389ffdbddaa709d5d18e](https://github.com/dotnet/runtime/commit/99f87de9b1deedd54f89389ffdbddaa709d5d18e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/907596760ed73c4025395ee502ea7b3c1d285d9e...99f87de9b1deedd54f89389ffdbddaa709d5d18e)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in ByteMark

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

  • [BenchBitOps - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 990.84 ms | 1173.85 ms | 1.18 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'ByteMark*'
```

### ByteMark.BenchBitOps

#### 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 | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [907596760ed73c4025395ee502ea7b3c1d285d9e](https://github.com/dotnet/runtime/commit/907596760ed73c4025395ee502ea7b3c1d285d9e)
Compare | [99f87de9b1deedd54f89389ffdbddaa709d5d18e](https://github.com/dotnet/runtime/commit/99f87de9b1deedd54f89389ffdbddaa709d5d18e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/907596760ed73c4025395ee502ea7b3c1d285d9e...99f87de9b1deedd54f89389ffdbddaa709d5d18e)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.TryGetValueTrue<SmallClass, SmallClass>

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

  • [OrderedDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 4.93 μs | 6.69 μs | 1.36 | 0.29 | 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.Collections.TryGetValueTrue*'
```

### System.Collections.TryGetValueTrue<SmallClass, SmallClass>.OrderedDictionary(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)

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