dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 1 Regression on 7/19/2026 5:54:44 PM +00:00

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arch-arm64 branch-refs/heads/main compilationmode-tiered kind-sve Noise os-linux perf-regression runkind-sve runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [2515f972d25ec6ab5868f696273bd02a6275e273](https://github.com/dotnet/runtime/commit/2515f972d25ec6ab5868f696273bd02a6275e273)
Compare | [f43516f45fff5920eabd11753bd5f1803cfacd0c](https://github.com/dotnet/runtime/commit/f43516f45fff5920eabd11753bd5f1803cfacd0c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2515f972d25ec6ab5868f696273bd02a6275e273...f43516f45fff5920eabd11753bd5f1803cfacd0c)
Configs | CompilationMode:tiered, RunKind:sve

### Regressions in SveBenchmarks.Clamp

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

  • [Scalar - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.33 μs | 15.42 μs | 1.65 | 0.49 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SveBenchmarks.Clamp*'
```

### SveBenchmarks.Clamp.Scalar(Size: 10015)

#### 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 src/benchmarks/micro/sve/Clamp.cs at lines 45-55 and reproduce SveBenchmarks.Clamp with the provided benchmarks_ci.py command. Compare the baseline and test commits, then inspect the linked test report and available IR or disassembly details to isolate the ARM64 SVE regression. Done means identifying and addressing the cause so the benchmark no longer shows the reported slowdown.

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
Mostly clear
Newbie friendliness
42/100

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