[Perf] Linux/x64: 3 Regressions on 6/29/2026 8:57:54 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [b97dd2f4b6aec05e98c71ec9830fa19de920af8b](https://github.com/dotnet/sdk/commit/b97dd2f4b6aec05e98c71ec9830fa19de920af8b)
Compare | [7c528f6e19c5245206de3dc561eb8a110bf9f746](https://github.com/dotnet/sdk/commit/7c528f6e19c5245206de3dc561eb8a110bf9f746)
Diff | [Diff](https://github.com/dotnet/sdk/compare/b97dd2f4b6aec05e98c71ec9830fa19de920af8b...7c528f6e19c5245206de3dc561eb8a110bf9f746)
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]()

| 21.64 μs | 25.09 μs | 1.16 | 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 | [b97dd2f4b6aec05e98c71ec9830fa19de920af8b](https://github.com/dotnet/sdk/commit/b97dd2f4b6aec05e98c71ec9830fa19de920af8b)
Compare | [7c528f6e19c5245206de3dc561eb8a110bf9f746](https://github.com/dotnet/sdk/commit/7c528f6e19c5245206de3dc561eb8a110bf9f746)
Diff | [Diff](https://github.com/dotnet/sdk/compare/b97dd2f4b6aec05e98c71ec9830fa19de920af8b...7c528f6e19c5245206de3dc561eb8a110bf9f746)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.TwoBodyConstraintBenchmarks

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

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

| 82.93 μs | 97.94 μs | 1.18 | 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.TwoBodyConstraintBenchmarks*'
```

### DemoBenchmarks.TwoBodyConstraintBenchmarks.DistanceServo

#### 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 | [b97dd2f4b6aec05e98c71ec9830fa19de920af8b](https://github.com/dotnet/sdk/commit/b97dd2f4b6aec05e98c71ec9830fa19de920af8b)
Compare | [7c528f6e19c5245206de3dc561eb8a110bf9f746](https://github.com/dotnet/sdk/commit/7c528f6e19c5245206de3dc561eb8a110bf9f746)
Diff | [Diff](https://github.com/dotnet/sdk/compare/b97dd2f4b6aec05e98c71ec9830fa19de920af8b...7c528f6e19c5245206de3dc561eb8a110bf9f746)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GroupedCollisionTesterBenchmarks

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

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

| 4.26 ms | 5.03 ms | 1.18 | 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.ExpensiveCollisionBenchmarks

#### 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 scripts/benchmarks_ci.py and the three benchmark sources: GatherScatterBenchmarks.cs, TwoBodyConstraintBenchmarks.cs, and GroupedCollisionTesterBenchmarks.cs. Run each supplied filter against the documented baseline and compare commits on Ubuntu 22.04 x64. Done means confirming and triaging the three reported performance regressions.

Written by the indexing model from the issue text.