[Perf] Linux/x64: 1 Regression on 5/12/2026 2:18:49 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [3caa97ab2ceaf0185ca6de09c6cc497dccfe6f3e](https://github.com/dotnet/runtime/commit/3caa97ab2ceaf0185ca6de09c6cc497dccfe6f3e)
Compare | [303a9aad6d3364bec0a7921966ccf21b970ab644](https://github.com/dotnet/runtime/commit/303a9aad6d3364bec0a7921966ccf21b970ab644)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3caa97ab2ceaf0185ca6de09c6cc497dccfe6f3e...303a9aad6d3364bec0a7921966ccf21b970ab644)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

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

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

• [Read_NoBuffering - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config 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.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize: 1048576, userBufferSize: 16384, 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)