[Perf] Linux/x64: 2 Regressions on 8/6/2026 5:23:12 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [322f5005d6589845edf1d69d55820a7d1ab9a09c](https://github.com/dotnet/sdk/commit/322f5005d6589845edf1d69d55820a7d1ab9a09c)
Compare | [8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4](https://github.com/dotnet/sdk/commit/8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4)
Diff | [Diff](https://github.com/dotnet/sdk/compare/322f5005d6589845edf1d69d55820a7d1ab9a09c...8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4)
Configs | CompilationMode:tiered, RunKind:akadeindexedset

### Regressions in Akade.IndexedSet.Benchmarks.RangeIndexBenchmarks

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

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

| 3.50 μs | 4.11 μs | 1.17 | 0.00 | True | | |

![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 'Akade.IndexedSet.Benchmarks.RangeIndexBenchmarks*'
```

### Akade.IndexedSet.Benchmarks.RangeIndexBenchmarks.LessThan_IndexedSet

#### 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 | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [322f5005d6589845edf1d69d55820a7d1ab9a09c](https://github.com/dotnet/sdk/commit/322f5005d6589845edf1d69d55820a7d1ab9a09c)
Compare | [8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4](https://github.com/dotnet/sdk/commit/8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4)
Diff | [Diff](https://github.com/dotnet/sdk/compare/322f5005d6589845edf1d69d55820a7d1ab9a09c...8a6d49a3ce3bd6d5fcbac911e446b9cce5767ae4)
Configs | CompilationMode:tiered, RunKind:akadeindexedset

### Regressions in Akade.IndexedSet.Benchmarks.ConcurrentSetBenchmarks

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

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

| 13.89 ns | 15.36 ns | 1.11 | 0.00 | True | | |

![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 'Akade.IndexedSet.Benchmarks.ConcurrentSetBenchmarks*'
```

### Akade.IndexedSet.Benchmarks.ConcurrentSetBenchmarks.LessThanLookup

#### 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 linked RangeIndexBenchmarks.cs and ConcurrentSetBenchmarks.cs benchmark entries, then run the provided benchmarks_ci.py commands using the Akade.IndexedSet filters. Compare the reported results with the baseline and compare commits and inspect the linked performance reports. Done means identifying and addressing the cause of both reported Linux/x64 regressions, with benchmark results confirming the change.

Written by the indexing model from the issue text.