[Perf] Linux/x64: 2 Regressions on 4/22/2026 3:08:58 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [81b1c762c37d15a57a3b3b693447fbcd8d6df55c](https://github.com/dotnet/runtime/commit/81b1c762c37d15a57a3b3b693447fbcd8d6df55c)
Compare | [2b16e8b5ade016f59af473acca1efd5c37bbfa2c](https://github.com/dotnet/runtime/commit/2b16e8b5ade016f59af473acca1efd5c37bbfa2c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/81b1c762c37d15a57a3b3b693447fbcd8d6df55c...2b16e8b5ade016f59af473acca1efd5c37bbfa2c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in BenchmarksGame.FannkuchRedux_9

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

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

| 78.00 ms | 92.21 ms | 1.18 | 0.05 | 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 'BenchmarksGame.FannkuchRedux_9*'
```

### BenchmarksGame.FannkuchRedux_9.RunBench(n: 11, expectedSum: 556355)

#### 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 | [81b1c762c37d15a57a3b3b693447fbcd8d6df55c](https://github.com/dotnet/runtime/commit/81b1c762c37d15a57a3b3b693447fbcd8d6df55c)
Compare | [2b16e8b5ade016f59af473acca1efd5c37bbfa2c](https://github.com/dotnet/runtime/commit/2b16e8b5ade016f59af473acca1efd5c37bbfa2c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/81b1c762c37d15a57a3b3b693447fbcd8d6df55c...2b16e8b5ade016f59af473acca1efd5c37bbfa2c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in BenchmarksGame.FannkuchRedux_5

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

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

| 13.41 ms | 15.76 ms | 1.17 | 0.01 | 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 'BenchmarksGame.FannkuchRedux_5*'
```

### BenchmarksGame.FannkuchRedux_5.RunBench(n: 10, expectedSum: 38)

#### 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)