[Perf] Linux/x64: 1 Regression on 3/30/2026 6:50:26 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [51cfb0e382532e43500216c755d8bd8e1a8f371d](https://github.com/dotnet/runtime/commit/51cfb0e382532e43500216c755d8bd8e1a8f371d)
Compare | [dee90053c49186ab0fd81c4b599c2624b495f614](https://github.com/dotnet/runtime/commit/dee90053c49186ab0fd81c4b599c2624b495f614)
Diff | [Diff](https://github.com/dotnet/runtime/compare/51cfb0e382532e43500216c755d8bd8e1a8f371d...dee90053c49186ab0fd81c4b599c2624b495f614)
Configs | 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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

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