[Perf] Linux/arm64: 2 Improvements on 8/11/2026 4:34:13 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [b470543f2f101c83205ac0a0e008c934be9774db](https://github.com/dotnet/runtime/commit/b470543f2f101c83205ac0a0e008c934be9774db)
Compare | [1fdccbc9c3690a80a9579bdc0e9be997db1ac0de](https://github.com/dotnet/runtime/commit/1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b470543f2f101c83205ac0a0e008c934be9774db...1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.MemoryStreamTests

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

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

| 29.44 ns | 23.43 ns | 0.80 | 0.24 | 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.IO.Tests.MemoryStreamTests*'
```

### System.IO.Tests.MemoryStreamTests.CopyToAsync(Size: 65536)

#### 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 | [b470543f2f101c83205ac0a0e008c934be9774db](https://github.com/dotnet/runtime/commit/b470543f2f101c83205ac0a0e008c934be9774db)
Compare | [1fdccbc9c3690a80a9579bdc0e9be997db1ac0de](https://github.com/dotnet/runtime/commit/1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b470543f2f101c83205ac0a0e008c934be9774db...1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in Microsoft.Extensions.DependencyInjection.TimeToFirstService

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

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

| 1.55 μs | 1.38 μs | 0.89 | 0.22 | 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 'Microsoft.Extensions.DependencyInjection.TimeToFirstService*'
```

### Microsoft.Extensions.DependencyInjection.TimeToFirstService.BuildProvider(Mode: "Default")

#### 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)

Start with the benchmark sources at performance/src/benchmarks/micro/libraries/System.IO/MemoryStreamTests.cs and performance/src/benchmarks/micro/libraries/Microsoft.Extensions.DependencyInjection/TimeToFirstServiceBenchmark.cs. Run the two benchmarks using the provided benchmarks_ci.py commands and inspect the linked reports. The issue records improvements, but provides no requested code change or completion condition.

Written by the indexing model from the issue text.