[Perf] Linux/arm64: 6 Improvements on 8/12/2026 5:14:24 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [6597edb0936de18005623b1a17adf29880df60e6](https://github.com/dotnet/runtime/commit/6597edb0936de18005623b1a17adf29880df60e6)
Compare | [1a576031b2ba2fca7055863d24934d0d593820af](https://github.com/dotnet/runtime/commit/1a576031b2ba2fca7055863d24934d0d593820af)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6597edb0936de18005623b1a17adf29880df60e6...1a576031b2ba2fca7055863d24934d0d593820af)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.CtorDefaultSize<Int32>

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

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

| 9.78 ns | 6.74 ns | 0.69 | 0.60 | False | | |
|

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

| 9.45 ns | 6.66 ns | 0.70 | 0.57 | False | | |
|

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

| 13.89 ns | 10.15 ns | 0.73 | 0.70 | False | | |
|

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

| 9.61 ns | 7.48 ns | 0.78 | 0.59 | False | | |
|

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

| 35.20 ns | 27.53 ns | 0.78 | 0.75 | False | | |
|

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

| 14.12 ns | 12.29 ns | 0.87 | 0.69 | False | | |

![graph]()
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[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.CtorDefaultSize*'
```

### System.Collections.CtorDefaultSize<Int32>.Queue

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.Stack

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.SortedSet

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.LinkedList

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.SortedDictionary

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorDefaultSize<Int32>.SortedList

#### 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 source at src/benchmarks/micro/libraries/System.Collections/Create/CtorDefaultSize.cs, especially the lines linked for Queue, Stack, SortedSet, LinkedList, SortedDictionary, and SortedList. Read the benchmarking and profiling workflow docs, then run the provided benchmarks_ci.py filter on Ubuntu arm64 and compare the reported results with the linked baseline and test reports. Done means explaining and validating the reported performance change.

Written by the indexing model from the issue text.