[Perf] Linux/x64: 6 Regressions on 5/4/2026 11:06:42 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [fcd092d376288c6c8c587217565f74107b9a3593](https://github.com/dotnet/runtime/commit/fcd092d376288c6c8c587217565f74107b9a3593)
Compare | [f1ca590eaa790d84d8d9eebf3185bff65865a65d](https://github.com/dotnet/runtime/commit/f1ca590eaa790d84d8d9eebf3185bff65865a65d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/fcd092d376288c6c8c587217565f74107b9a3593...f1ca590eaa790d84d8d9eebf3185bff65865a65d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in PerfLabTests.CastingPerf

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

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

| 53.66 ms | 83.08 ms | 1.55 | 0.40 | False | | |
|

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

| 12.81 ms | 14.06 ms | 1.10 | 0.30 | False | | |
|

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

| 7.36 ms | 8.06 ms | 1.09 | 0.41 | False | | |
|

• [FooObjIsFoo2 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 7.57 ms | 8.27 ms | 1.09 | 0.36 | False | | |

![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 'PerfLabTests.CastingPerf*'
```

### PerfLabTests.CastingPerf.IFooObjIsIFooInterAlia

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.FooObjCastIfIsa

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.ObjrefValueTypeObj

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.FooObjIsFoo2

#### 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 | [fcd092d376288c6c8c587217565f74107b9a3593](https://github.com/dotnet/runtime/commit/fcd092d376288c6c8c587217565f74107b9a3593)
Compare | [f1ca590eaa790d84d8d9eebf3185bff65865a65d](https://github.com/dotnet/runtime/commit/f1ca590eaa790d84d8d9eebf3185bff65865a65d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/fcd092d376288c6c8c587217565f74107b9a3593...f1ca590eaa790d84d8d9eebf3185bff65865a65d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in Microsoft.Extensions.Logging.LoggingOverhead

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

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

| 3.10 μs | 3.56 μs | 1.15 | 0.45 | False | | |
|

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

| 522.50 ns | 593.86 ns | 1.14 | 0.38 | 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 'Microsoft.Extensions.Logging.LoggingOverhead*'
```

### Microsoft.Extensions.Logging.LoggingOverhead.TwoArguments_DefineMessage

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Logging.LoggingOverhead.TwoArguments_DefineMessage_FilteredByLevel

#### 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)