[Perf] Linux/x64: 4 Regressions on 1/22/2026 10:39:48 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed](https://github.com/dotnet/sdk/commit/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed)
Compare | [b502b6eeec0db06720ead7fd9570befa39a6b2f7](https://github.com/dotnet/sdk/commit/b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Diff | [Diff](https://github.com/dotnet/sdk/compare/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed...b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GatherScatterBenchmarks

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

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

| 22.15 μs | 25.24 μs | 1.14 | 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 'DemoBenchmarks.GatherScatterBenchmarks*'
```

### DemoBenchmarks.GatherScatterBenchmarks.GatherState

#### 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 | [cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed](https://github.com/dotnet/sdk/commit/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed)
Compare | [b502b6eeec0db06720ead7fd9570befa39a6b2f7](https://github.com/dotnet/sdk/commit/b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Diff | [Diff](https://github.com/dotnet/sdk/compare/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed...b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.TwoBodyConstraintBenchmarks

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

• [Contact4 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 290.35 μs | 379.22 μs | 1.31 | 0.00 | True | | |
|

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

| 65.11 μs | 79.99 μs | 1.23 | 0.00 | True | | |

![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 'DemoBenchmarks.TwoBodyConstraintBenchmarks*'
```

### DemoBenchmarks.TwoBodyConstraintBenchmarks.Contact4

#### ETL Files

#### Histogram

#### JIT Disasms

### DemoBenchmarks.TwoBodyConstraintBenchmarks.BallSocket

#### 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 | [cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed](https://github.com/dotnet/sdk/commit/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed)
Compare | [b502b6eeec0db06720ead7fd9570befa39a6b2f7](https://github.com/dotnet/sdk/commit/b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Diff | [Diff](https://github.com/dotnet/sdk/compare/cdbdb8f49a61a93d2ece59a66bed09e111cbb2ed...b502b6eeec0db06720ead7fd9570befa39a6b2f7)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GroupedCollisionTesterBenchmarks

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

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

| 237.53 μs | 422.83 μs | 1.78 | 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 'DemoBenchmarks.GroupedCollisionTesterBenchmarks*'
```

### DemoBenchmarks.GroupedCollisionTesterBenchmarks.ModerateCostCollisionBenchmarks

#### 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)