[Perf] Linux/arm64: 4 Regressions on 6/2/2026 10:24:00 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [c7d89359fb2afdb3cf045f26c61350885a714811](https://github.com/dotnet/runtime/commit/c7d89359fb2afdb3cf045f26c61350885a714811)
Compare | [ac695692911547e710e43fa7f6e38546a13504a5](https://github.com/dotnet/runtime/commit/ac695692911547e710e43fa7f6e38546a13504a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c7d89359fb2afdb3cf045f26c61350885a714811...ac695692911547e710e43fa7f6e38546a13504a5)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Threading.Tests.Perf_SemaphoreSlim

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

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

| 6.20 μs | 23.94 μs | 3.86 | 0.66 | False | | |
|

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

| 9.50 μs | 21.00 μs | 2.21 | 0.64 | False | | |
|

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

| 9.28 μs | 20.41 μs | 2.20 | 0.68 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Threading.Tests.Perf_SemaphoreSlim*'
```

### System.Threading.Tests.Perf_SemaphoreSlim.ReleaseWaitAsync_WithCancellationToken

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tests.Perf_SemaphoreSlim.ReleaseWaitAsync_WithCancellationTokenAndTimeout

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tests.Perf_SemaphoreSlim.ReleaseWaitAsync_WithTimeout

#### 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 | [c7d89359fb2afdb3cf045f26c61350885a714811](https://github.com/dotnet/runtime/commit/c7d89359fb2afdb3cf045f26c61350885a714811)
Compare | [ac695692911547e710e43fa7f6e38546a13504a5](https://github.com/dotnet/runtime/commit/ac695692911547e710e43fa7f6e38546a13504a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c7d89359fb2afdb3cf045f26c61350885a714811...ac695692911547e710e43fa7f6e38546a13504a5)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

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

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

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

| 28.26 μs | 29.78 μs | 1.05 | 0.07 | 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.Collections.CtorFromCollection*'
```

### System.Collections.CtorFromCollection<String>.ImmutableQueue(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)