[Perf] Linux/arm64: 1 Regression on 2/21/2026 2:00:00 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [127fe2d9e792b2fa4885a933348a8bf18bf16a34](https://github.com/dotnet/runtime/commit/127fe2d9e792b2fa4885a933348a8bf18bf16a34)
Compare | [e2a94a1b7a621ea9339ad4c4919d732b9f4aadf7](https://github.com/dotnet/runtime/commit/e2a94a1b7a621ea9339ad4c4919d732b9f4aadf7)
Diff | [Diff](https://github.com/dotnet/runtime/compare/127fe2d9e792b2fa4885a933348a8bf18bf16a34...e2a94a1b7a621ea9339ad4c4919d732b9f4aadf7)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.TryAddDefaultSize<Int32>

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

• [ConcurrentDictionary - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config 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.TryAddDefaultSize*'
```

### System.Collections.TryAddDefaultSize<Int32>.ConcurrentDictionary(Count: 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)