dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 9 Regressions on 7/8/2026 8:49:11 AM +00:00

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arch-arm64 branch-refs/heads/main compilationmode-tiered kind-micro Look Again os-linux perf-regression r2rtype-r2r_interpreter runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9](https://github.com/dotnet/runtime/commit/c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9)
Compare | [3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc](https://github.com/dotnet/runtime/commit/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9...3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_Matrix4x4

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

  • [CreateFromQuaternionBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.15 ns | 15.06 ns | 4.79 | 0.50 | False | | |
|
  • [CreatePerspectiveOffCenterBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.18 ns | 10.29 ns | 3.23 | 0.49 | False | | |
|
  • [CreateOrthographicOffCenterBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.99 ns | 8.60 ns | 2.88 | 0.51 | False | | |
|
  • [CreatePerspectiveBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.49 ns | 7.36 ns | 2.11 | 0.48 | False | | |
|
  • [CreatePerspectiveFieldOfViewBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.03 ns | 22.93 ns | 1.43 | 0.10 | False | | |
|
  • [CreateBillboardBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.11 ns | 17.42 ns | 1.15 | 0.06 | False | | |

![graph]()
![graph]()
![graph]()
![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_Matrix4x4*'
```

### System.Numerics.Tests.Perf_Matrix4x4.CreateFromQuaternionBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix4x4.CreatePerspectiveOffCenterBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix4x4.CreateOrthographicOffCenterBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix4x4.CreatePerspectiveBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix4x4.CreatePerspectiveFieldOfViewBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix4x4.CreateBillboardBenchmark

#### 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 | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9](https://github.com/dotnet/runtime/commit/c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9)
Compare | [3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc](https://github.com/dotnet/runtime/commit/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c76054f5cb1aae6ab146ec7a8db70ca3aeda4ac9...3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_Matrix3x2

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

  • [MultiplyByMatrixBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.75 ns | 973.00 ns | 99.81 | 0.07 | False | | |
|
  • [MultiplyByMatrixOperatorBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.77 ns | 961.77 ns | 98.43 | 0.13 | False | | |
|
  • [InvertBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.65 ns | 11.97 ns | 4.51 | 0.13 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_Matrix3x2*'
```

### System.Numerics.Tests.Perf_Matrix3x2.MultiplyByMatrixBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix3x2.MultiplyByMatrixOperatorBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Matrix3x2.InvertBenchmark

#### 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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the benchmark source at src/benchmarks/micro/libraries/System.Numerics.Vectors/Perf_Matrix4x4.cs and compare the linked baseline and test results. Run benchmarks_ci.py with the System.Numerics.Tests.Perf_Matrix4x4* filter on the documented environment, then investigate the reported ARM64 regressions. Done means the regressions are explained and the affected benchmark performance is restored or the issue is triaged with evidence.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
32/100

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