[Perf] Linux/x64: 3 Regressions on 8/28/2026 6:27:02 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [57c9c3fdcbc94ad98f0a4b8abedb7c6eadfb264b](https://github.com/dotnet/runtime/commit/57c9c3fdcbc94ad98f0a4b8abedb7c6eadfb264b)
Compare | [d2ea726dd3d8faad797755c9fbb1ff15226e25f0](https://github.com/dotnet/runtime/commit/d2ea726dd3d8faad797755c9fbb1ff15226e25f0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/57c9c3fdcbc94ad98f0a4b8abedb7c6eadfb264b...d2ea726dd3d8faad797755c9fbb1ff15226e25f0)
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 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 55.52 μs | 88.72 μs | 1.60 | 0.60 | False | | |
|

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

| 62.12 μs | 88.69 μs | 1.43 | 0.59 | False | | |
|

• [Get_EnumerateHeaders_Unvalidated - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 65.10 μs | 86.74 μs | 1.33 | 0.61 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Net.Http.Tests.SocketsHttpHandlerPerfTest*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Http.Tests.SocketsHttpHandlerPerfTest.Get_EnumerateHeaders_Unvalidated(ssl: False, 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)

Start with the benchmark source at performance/src/benchmarks/micro/libraries/System.Net.Http/Perf.SocketsHttpHandler.cs and the linked SocketsHttpHandlerPerfTest report. Run the provided benchmarks_ci.py command, then compare the baseline and regression commits and inspect the performance graphs. Done means identifying the cause of the three regressions, addressing it, and validating the benchmark results.

Written by the indexing model from the issue text.