[Perf] Linux/arm64: 2 Regressions on 5/19/2026 4:30:33 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [c00becf82d1f6135f1d0a5323ece70817de9b09a](https://github.com/dotnet/runtime/commit/c00becf82d1f6135f1d0a5323ece70817de9b09a)
Compare | [e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2](https://github.com/dotnet/runtime/commit/e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c00becf82d1f6135f1d0a5323ece70817de9b09a...e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in ByteMark

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

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

| 1.37 secs | 1.60 secs | 1.17 | 0.45 | 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 'ByteMark*'
```

### ByteMark.BenchBitOps

#### 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 | [c00becf82d1f6135f1d0a5323ece70817de9b09a](https://github.com/dotnet/runtime/commit/c00becf82d1f6135f1d0a5323ece70817de9b09a)
Compare | [e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2](https://github.com/dotnet/runtime/commit/e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c00becf82d1f6135f1d0a5323ece70817de9b09a...e9dec1b44a5bbdc573232b9b814fa4e1309ba7d2)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Net.Http.Tests.SocketsHttpHandlerPerfTest

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

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

| 12.82 ms | 18.28 ms | 1.43 | 0.78 | 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 'System.Net.Http.Tests.SocketsHttpHandlerPerfTest*'
```

### System.Net.Http.Tests.SocketsHttpHandlerPerfTest.Get_EnumerateHeaders_Validated(ssl: True, chunkedResponse: False, responseLength: 100000)

#### 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)