[Perf] Linux/x64: 3 Regressions on 5/21/2026 10:24:02 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

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

| 14.51 ms | 21.31 ms | 1.47 | 0.33 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.IndexerSet*'
```

### System.Collections.IndexerSet<String>.SortedList(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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

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

| 19.68 ms | 24.99 ms | 1.27 | 0.35 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.ContainsFalse*'
```

### System.Collections.ContainsFalse<String>.SortedSet(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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in MicroBenchmarks.Serializers.Json_ToString<Location>

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

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

| 87.60 μs | 101.92 μs | 1.16 | 0.29 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.Serializers.Json_ToString*'
```

### MicroBenchmarks.Serializers.Json_ToString<Location>.JsonNet_

#### 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)