[Perf] Windows/x64: 9 Regressions on 3/10/2026 8:09:51 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [68de53c1ec0e6cc230dc8da5a54e11e03edbd37c](https://github.com/dotnet/runtime/commit/68de53c1ec0e6cc230dc8da5a54e11e03edbd37c)
Compare | [1e1bbed9856fd11f562d5e5b23b43b938e23f437](https://github.com/dotnet/runtime/commit/1e1bbed9856fd11f562d5e5b23b43b938e23f437)
Diff | [Diff](https://github.com/dotnet/runtime/compare/68de53c1ec0e6cc230dc8da5a54e11e03edbd37c...1e1bbed9856fd11f562d5e5b23b43b938e23f437)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.IO.Tests.Perf_FileStream

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Write - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Write(fileSize%3a%201024%2c%20userBufferSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L225-#L228>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 95.40 μs | 105.21 μs | 1.10 | 0.45 | False | | |
|<ul><li>[ReadByte - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.ReadByte(fileSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L141-#L156>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 15.19 μs | 17.84 μs | 1.17 | 0.13 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201024%2c%20userBufferSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 12.30 μs | 15.35 μs | 1.25 | 0.16 | False | | |
|<ul><li>[SeekForward - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.SeekForward(fileSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L94-#L107>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 14.61 μs | 17.78 μs | 1.22 | 0.09 | False | | |
|<ul><li>[SeekBackward - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.SeekBackward(fileSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L109-#L122>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 16.17 μs | 19.20 μs | 1.19 | 0.08 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201024%2c%20userBufferSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 19.11 μs | 21.68 μs | 1.13 | 0.28 | False | | |
|<ul><li>[LockUnlock - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.LockUnlock(fileSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L76-#L92>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 18.88 μs | 22.44 μs | 1.19 | 0.29 | False | | |
|<ul><li>[LockUnlock - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.LockUnlock(fileSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L76-#L92>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 15.58 μs | 18.38 μs | 1.18 | 0.33 | False | | |
|<ul><li>[ReadByte - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.ReadByte(fileSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L141-#L156>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 20.41 μs | 23.83 μs | 1.17 | 0.11 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_006.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_007.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_008.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream_009.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_17_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Regression/System.IO.Tests.Perf_FileStream.html>)

### 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 'System.IO.Tests.Perf_FileStream*'
```

<details>

### System.IO.Tests.Perf_FileStream.Write(fileSize: 1024, userBufferSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.SeekForward(fileSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.SeekBackward(fileSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.LockUnlock(fileSize: 1024, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.LockUnlock(fileSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: Asynchronous)

#### 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)

</details>

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	68de53c1ec0e6cc230dc8da5a54e11e03edbd37c
Compare	1e1bbed9856fd11f562d5e5b23b43b938e23f437
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	95.40 μs	105.21 μs	1.10	0.45	False
ReadByte - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	15.19 μs	17.84 μs	1.17	0.13	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	12.30 μs	15.35 μs	1.25	0.16	False
SeekForward - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	14.61 μs	17.78 μs	1.22	0.09	False
SeekBackward - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	16.17 μs	19.20 μs	1.19	0.08	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	19.11 μs	21.68 μs	1.13	0.28	False
LockUnlock - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	18.88 μs	22.44 μs	1.19	0.29	False
LockUnlock - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	15.58 μs	18.38 μs	1.18	0.33	False
ReadByte - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	20.41 μs	23.83 μs	1.17	0.11	False

[Perf] Windows/x64: 9 Regressions on 3/10/2026 8:09:51 PM +00:00 #125660

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Regressions in System.IO.Tests.Perf_FileStream

Repro

System.IO.Tests.Perf_FileStream.Write(fileSize: 1024, userBufferSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.SeekForward(fileSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.SeekBackward(fileSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

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System.IO.Tests.Perf_FileStream.LockUnlock(fileSize: 1024, options: Asynchronous)

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System.IO.Tests.Perf_FileStream.LockUnlock(fileSize: 1024, options: None)

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System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: Asynchronous)

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JIT Disasms

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