[Perf] Linux/x64: 2 Regressions on 4/12/2026 2:20:28 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [e583c98763e224e5d6587a9d8fc732a33b1d808b](https://github.com/dotnet/runtime/commit/e583c98763e224e5d6587a9d8fc732a33b1d808b)
Compare | [6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e](https://github.com/dotnet/runtime/commit/6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e583c98763e224e5d6587a9d8fc732a33b1d808b...6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.ComponentModel.Tests.Perf_TypeDescriptorTests

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

• [GetConverter - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 10.88 μs | 12.76 μs | 1.17 | 0.16 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.ComponentModel.Tests.Perf_TypeDescriptorTests*'
```

### System.ComponentModel.Tests.Perf_TypeDescriptorTests.GetConverter(typeToConvert: typeof(System.ComponentModel.Tests.SomeValueType?))

#### 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 | [e583c98763e224e5d6587a9d8fc732a33b1d808b](https://github.com/dotnet/runtime/commit/e583c98763e224e5d6587a9d8fc732a33b1d808b)
Compare | [6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e](https://github.com/dotnet/runtime/commit/6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e583c98763e224e5d6587a9d8fc732a33b1d808b...6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

• [Read - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 5.50 ms | 5.81 ms | 1.06 | 0.40 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1048576, userBufferSize: 512, 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)