[Perf] Linux/x64: 2 Improvements on 1/22/2026 11:57:44 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a035ab7d42601c2262e6f4d86a9a7d0b93c0c4ec](https://github.com/dotnet/runtime/commit/a035ab7d42601c2262e6f4d86a9a7d0b93c0c4ec)
Compare | [4657f3c907fe31c7cc818f81c316aa74f90b9906](https://github.com/dotnet/runtime/commit/4657f3c907fe31c7cc818f81c316aa74f90b9906)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a035ab7d42601c2262e6f4d86a9a7d0b93c0c4ec...4657f3c907fe31c7cc818f81c316aa74f90b9906)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.StringReaderReadToEndTests

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

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

| 12.59 ns | 11.47 ns | 0.91 | 0.32 | False | | |
|

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

| 6.58 ns | 5.42 ns | 0.82 | 0.46 | False | | |

![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.StringReaderReadToEndTests*'
```

### System.IO.Tests.StringReaderReadToEndTests.ReadToEndAsync(LineLengthRange: [ 0, 1024])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StringReaderReadToEndTests.ReadToEnd(LineLengthRange: [ 0, 1024])

#### 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)