[Perf] Linux/arm64: 5 Regressions on 3/9/2026 10:25:29 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82](https://github.com/dotnet/runtime/commit/e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82)
Compare | [173bdac01272cdb7354a99ef65db1d78c0145c75](https://github.com/dotnet/runtime/commit/173bdac01272cdb7354a99ef65db1d78c0145c75)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82...173bdac01272cdb7354a99ef65db1d78c0145c75)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.CtorFromCollection<String>

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

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

| 427.68 ns | 462.03 ns | 1.08 | 0.06 | False | | |
|

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

| 403.36 ns | 450.97 ns | 1.12 | 0.03 | False | | |
|

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

| 430.40 ns | 463.29 ns | 1.08 | 0.02 | False | | |
|

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

| 405.05 ns | 479.77 ns | 1.18 | 0.05 | False | | |

![graph]()
![graph]()
![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.Collections.CtorFromCollection*'
```

### System.Collections.CtorFromCollection<String>.Stack(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ImmutableArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.Queue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.List(Size: 512)

#### 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 | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82](https://github.com/dotnet/runtime/commit/e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82)
Compare | [173bdac01272cdb7354a99ef65db1d78c0145c75](https://github.com/dotnet/runtime/commit/173bdac01272cdb7354a99ef65db1d78c0145c75)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e9ec642ee7ab11ffe1b8e767809fe60dd4a45b82...173bdac01272cdb7354a99ef65db1d78c0145c75)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.CtorFromCollectionNonGeneric<String>

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

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

| 795.48 ns | 861.42 ns | 1.08 | 0.02 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CtorFromCollectionNonGeneric*'
```

### System.Collections.CtorFromCollectionNonGeneric<String>.ArrayList(Size: 512)

#### 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)