dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 8 Regressions on 7/29/2026 1:12:32 AM +00:00

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

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4d07108c0125e4741bda596f27740118c0fe3833](https://github.com/dotnet/runtime/commit/4d07108c0125e4741bda596f27740118c0fe3833)
Compare | [ff75b1cda518d813f4d5da9d8bc1fa2488872ff3](https://github.com/dotnet/runtime/commit/ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4d07108c0125e4741bda596f27740118c0fe3833...ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark

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

  • [CreateInstance_5_WithAttrLast - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 211.73 ns | 259.24 ns | 1.22 | 0.34 | False | | |
|
  • [Factory_3Explicit - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 11.01 ns | 12.81 ns | 1.16 | 0.17 | False | | |
|
  • [Factory_1Injected_2Explicit_OutOfOrder - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.07 ns | 31.22 ns | 1.15 | 0.08 | False | | |
|
  • [Factory_1Injected_2Explicit - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.99 ns | 30.55 ns | 1.13 | 0.04 | False | | |
|
  • [Factory_3Injected - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 53.52 ns | 58.42 ns | 1.09 | 0.06 | False | | |

![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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark*'
```

### Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark.CreateInstance_5_WithAttrLast

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark.Factory_3Explicit

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark.Factory_1Injected_2Explicit_OutOfOrder

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark.Factory_1Injected_2Explicit

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark.Factory_3Injected

#### 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 | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4d07108c0125e4741bda596f27740118c0fe3833](https://github.com/dotnet/runtime/commit/4d07108c0125e4741bda596f27740118c0fe3833)
Compare | [ff75b1cda518d813f4d5da9d8bc1fa2488872ff3](https://github.com/dotnet/runtime/commit/ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4d07108c0125e4741bda596f27740118c0fe3833...ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Formats.Cbor.Tests.Perf_CborReader

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

  • [SkipValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 48.49 ns | 51.36 ns | 1.06 | 0.07 | False | | |
|
  • [SkipValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 57.91 ns | 61.31 ns | 1.06 | 0.01 | False | | |

![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 'System.Formats.Cbor.Tests.Perf_CborReader*'
```

### System.Formats.Cbor.Tests.Perf_CborReader.SkipValue(encoding: (Integer, Strict))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Formats.Cbor.Tests.Perf_CborReader.SkipValue(encoding: (Text String, Strict))

#### 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 | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4d07108c0125e4741bda596f27740118c0fe3833](https://github.com/dotnet/runtime/commit/4d07108c0125e4741bda596f27740118c0fe3833)
Compare | [ff75b1cda518d813f4d5da9d8bc1fa2488872ff3](https://github.com/dotnet/runtime/commit/ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4d07108c0125e4741bda596f27740118c0fe3833...ff75b1cda518d813f4d5da9d8bc1fa2488872ff3)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in Microsoft.Extensions.DependencyInjection.TimeToFirstService

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

  • [BuildProvider - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.78 μs | 5.08 μs | 1.06 | 0.70 | 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 'Microsoft.Extensions.DependencyInjection.TimeToFirstService*'
```

### Microsoft.Extensions.DependencyInjection.TimeToFirstService.BuildProvider(Mode: "Default")

#### 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 baseline and compare commits, then run the documented benchmarks command for Microsoft.Extensions.DependencyInjection.ActivatorUtilitiesBenchmark. Read the referenced benchmark sources, including src/benchmarks/micro/libraries/Microsoft.Extensions.DependencyInjection/ActivatorUtilitiesBenchmark.cs and the Perf.CborReader.cs links, and compare the reported results. Done means identifying and addressing or clearly explaining the listed ARM64 regressions.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, python
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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