[Perf] Linux/arm64: 3 Regressions on 3/10/2026 3:27:36 AM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	0d0e1291faee412c0b124746bfdd7c6bbdcde5aa
Compare	2e14703d891b326548ad74340bad5b576b356abd
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Collections.CopyTo<String>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Memory - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	392.56 ns	905.53 ns	2.31	0.01	False
Span - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	380.28 ns	904.63 ns	2.38	0.01	False
Array - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	385.00 ns	903.81 ns	2.35	0.01	False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CopyTo<String>*'

Details

System.Collections.CopyTo<String>.Memory(Size: 2048)

ETL Files

Histogram

JIT Disasms

System.Collections.CopyTo<String>.Span(Size: 2048)

ETL Files

Histogram

JIT Disasms

System.Collections.CopyTo<String>.Array(Size: 2048)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[DrewScoggins]

There are only three commits in the range, and the only one that looks like it could even be partly related is @davidwrighton's change.

e3b528c...173bdac