[Perf] Linux/x64: 5 Regressions on 2/5/2026 12:12:48 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [0b60d265d30d96c827b73dbce74cb78f600d3c92](https://github.com/dotnet/sdk/commit/0b60d265d30d96c827b73dbce74cb78f600d3c92)
Compare | [181f8798913e9c234e19756db58f38a8cac176ea](https://github.com/dotnet/sdk/commit/181f8798913e9c234e19756db58f38a8cac176ea)
Diff | [Diff](https://github.com/dotnet/sdk/compare/0b60d265d30d96c827b73dbce74cb78f600d3c92...181f8798913e9c234e19756db58f38a8cac176ea)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.TwoBodyConstraintBenchmarks

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

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

| 94.86 μs | 123.16 μs | 1.30 | 0.00 | True | | |
|

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

| 85.69 μs | 104.08 μs | 1.21 | 0.00 | True | | |
|

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

| 65.32 μs | 78.83 μs | 1.21 | 0.00 | True | | |

![graph]()
![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.LinearAxisServo

#### ETL Files

#### Histogram

#### JIT Disasms

### DemoBenchmarks.TwoBodyConstraintBenchmarks.DistanceServo

#### 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 | [0b60d265d30d96c827b73dbce74cb78f600d3c92](https://github.com/dotnet/sdk/commit/0b60d265d30d96c827b73dbce74cb78f600d3c92)
Compare | [181f8798913e9c234e19756db58f38a8cac176ea](https://github.com/dotnet/sdk/commit/181f8798913e9c234e19756db58f38a8cac176ea)
Diff | [Diff](https://github.com/dotnet/sdk/compare/0b60d265d30d96c827b73dbce74cb78f600d3c92...181f8798913e9c234e19756db58f38a8cac176ea)
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]()

| 22.38 μs | 25.49 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 | [0b60d265d30d96c827b73dbce74cb78f600d3c92](https://github.com/dotnet/sdk/commit/0b60d265d30d96c827b73dbce74cb78f600d3c92)
Compare | [181f8798913e9c234e19756db58f38a8cac176ea](https://github.com/dotnet/sdk/commit/181f8798913e9c234e19756db58f38a8cac176ea)
Diff | [Diff](https://github.com/dotnet/sdk/compare/0b60d265d30d96c827b73dbce74cb78f600d3c92...181f8798913e9c234e19756db58f38a8cac176ea)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GroupedCollisionTesterBenchmarks

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

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

| 16.93 μs | 22.20 μs | 1.31 | 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.CheapCollisionBenchmarks

#### 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 benchmark sources listed in src/benchmarks/real-world/bepuphysics2/TwoBodyConstraintBenchmarks.cs, GatherScatterBenchmarks.cs, and GroupedCollisionTesterBenchmarks.cs, then compare the baseline and comparison commits. Run benchmarks_ci.py with the listed filters and review the linked reports to identify the cause of the regressions. Done means the regressions are explained and the affected benchmarks return to baseline performance.

Written by the indexing model from the issue text.