[Perf] Linux/x64: 1 Regression on 8/28/2026 10:03:38 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [bf3289d05dff3962cdccb0e81b5315990e5b1198](https://github.com/dotnet/sdk/commit/bf3289d05dff3962cdccb0e81b5315990e5b1198)
Compare | [100002779ceec649fcfd00c233f673b494130827](https://github.com/dotnet/sdk/commit/100002779ceec649fcfd00c233f673b494130827)
Diff | [Diff](https://github.com/dotnet/sdk/compare/bf3289d05dff3962cdccb0e81b5315990e5b1198...100002779ceec649fcfd00c233f673b494130827)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

• [ConcurrentLessThanLookup - 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 'Akade.IndexedSet.Benchmarks.ConcurrentSetBenchmarks*'
```

### Akade.IndexedSet.Benchmarks.ConcurrentSetBenchmarks.ConcurrentLessThanLookup

#### 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 src/benchmarks/real-world/Akade.IndexedSet.Benchmarks/ConcurrentSetBenchmarks.cs, especially ConcurrentLessThanLookup, and run the provided benchmarks_ci.py command. Compare the listed baseline and test commits and review the linked benchmark and test reports. Done means identifying the cause of the 11% regression and confirming the benchmark no longer shows it.

Written by the indexing model from the issue text.