Regressions in System.Tests.Perf_String Case Conversion

### Run Information

Architecture | arm64
-- | --
OS | Windows 10.0.25094
Baseline | [5fdc1882a63dd1e34ad852f9bfc1964c511e5bfb](https://github.com/dotnet/runtime/commit/5fdc1882a63dd1e34ad852f9bfc1964c511e5bfb)
Compare | [f85d515e2f64ddd5b014585d2d10a005ce55943e](https://github.com/dotnet/runtime/commit/f85d515e2f64ddd5b014585d2d10a005ce55943e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5fdc1882a63dd1e34ad852f9bfc1964c511e5bfb...f85d515e2f64ddd5b014585d2d10a005ce55943e)


### Regressions in System.Tests.Perf_String

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[ToUpperInvariant - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToUpperInvariant(s%3a%20%22TeSt%22).html>) | 28.29 ns | 39.48 ns | 1.40 | 0.72 | False | | |
[ToUpperInvariant - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToUpperInvariant(s%3a%20%22TEST%22).html>) | 9.05 ns | 11.98 ns | 1.32 | 0.77 | False | | |
[ToUpper - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToUpper(s%3a%20%22TEST%22).html>) | 19.02 ns | 29.27 ns | 1.54 | 0.71 | False | | |
[ToLowerInvariant - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToLowerInvariant(s%3a%20%22test%22).html>) | 8.80 ns | 12.60 ns | 1.43 | 0.81 | False | | |
[ToLower - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToLower(s%3a%20%22TEST%22).html>) | 42.54 ns | 57.78 ns | 1.36 | 0.68 | False | | |
[ToLowerInvariant - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToLowerInvariant(s%3a%20%22TeSt%22).html>) | 24.94 ns | 36.73 ns | 1.47 | 0.72 | False | | |
[ToUpper - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToUpper(s%3a%20%22test%22).html>) | 45.27 ns | 52.32 ns | 1.16 | 0.58 | False | | |
[ToUpper - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_Windows 10.0.25094/System.Tests.Perf_String.ToUpper(s%3a%20%22TeSt%22).html>) | 44.98 ns | 56.00 ns | 1.24 | 0.62 | False | | |

![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_2.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_3.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_4.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_5.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_6.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_7.png>)
![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String_8.png>)
[Test Report](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/12_29_2022/refs/heads/main_arm64_Windows%2010.0.25094_Regression/System.Tests.Perf_String.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_String*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-4624cd99-b693-4101-9daa-6a8b8567bdb47822b21aedf47caa5/1466aae5-def5-4a54-b4d0-d5cc6909d249.zip?sv=2021-08-06&se=2023-01-20T12%3A48%3A01Z&sr=c&sp=rl&sig=LDe%2FGcZ%2BZ7kVzNCYGAbCX6GCje%2BU6tFCp1uannptqQ4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-a5cad55a-65d6-4eba-8da4-572d53c560b35ba7bedcb174536be/dada5e92-0497-4e8c-80d8-c701a9c1805b.zip?sv=2021-08-06&se=2023-01-21T04%3A39%3A39Z&sr=c&sp=rl&sig=eNGyjwHka7Z8EI%2Fwi3LTd3lbdh6lgLOMflIYJ6JQuNc%3D>)
### Histogram

#### System.Tests.Perf_String.ToUpperInvariant(s: "TeSt")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 39.47873435471007 > 29.55419313532894.
IsChangePoint: Marked as a change because one of 12/21/2022 4:32:37 PM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -7.516307420817177 (T) = (0 -36.31159282300522) / Math.Sqrt((6.485055935336934 / (14)) + (12.04881980952785 / (19))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (14) + (19) - 2, .025) and -0.2768748064919276 = (28.437864572461343 - 36.31159282300522) / 28.437864572461343 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToUpperInvariant(s: "TEST")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 11.975986271581252 > 8.57081540231266.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -10.528910434957075 (T) = (0 -12.670162918498763) / Math.Sqrt((0.9342617633884106 / (13)) + (1.3978707752175097 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.455349894058753 = (8.705922177355973 - 12.670162918498763) / 8.705922177355973 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToUpper(s: "TEST")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 29.270366724424157 > 23.711182658784026.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -4.729387196157553 (T) = (0 -29.081157109263945) / Math.Sqrt((7.270743704699143 / (13)) + (18.92406524654969 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.249283338924745 = (23.278271792445437 - 29.081157109263945) / 23.278271792445437 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToLowerInvariant(s: "test")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 12.60029331392485 > 10.08381371016749.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -13.323683013167399 (T) = (0 -13.312894081097156) / Math.Sqrt((0.7323565603260572 / (13)) + (0.922625991673902 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.47137407848493657 = (9.047933000699148 - 13.312894081097156) / 9.047933000699148 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToLower(s: "TEST")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 57.78163572052392 > 45.89678537255734.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -9.773996404508368 (T) = (0 -57.90920894745648) / Math.Sqrt((18.524028895609252 / (13)) + (15.211097039304933 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.3324730115054145 = (43.45994886758062 - 57.90920894745648) / 43.45994886758062 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToLowerInvariant(s: "TeSt")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 36.725989098628034 > 27.801417460552333.
IsChangePoint: Marked as a change because one of 12/21/2022 4:32:37 PM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -8.310103036986714 (T) = (0 -37.18313751161428) / Math.Sqrt((13.233221291647697 / (14)) + (5.573183595058514 / (19))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (14) + (19) - 2, .025) and -0.3310691743603315 = (27.93478973734275 - 37.18313751161428) / 27.93478973734275 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToUpper(s: "test")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 52.323958191242674 > 47.40437991582669.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -4.4004308610229765 (T) = (0 -50.867662849307834) / Math.Sqrt((11.393547554407128 / (13)) + (35.81423435130752 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.164521962629386 = (43.681153710878256 - 50.867662849307834) / 43.681153710878256 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.ToUpper(s: "TeSt")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 56.00128879385484 > 46.33821886816768.
IsChangePoint: Marked as a change because one of 12/21/2022 10:31:08 AM, 12/28/2022 6:20:56 PM falls between 12/19/2022 10:34:07 PM and 12/28/2022 6:20:56 PM.
IsRegressionStdDev: Marked as regression because -6.77350029426643 (T) = (0 -52.110090547734465) / Math.Sqrt((11.084131575618784 / (13)) + (14.915230097096984 / (20))) is less than -2.0395134463927462 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (13) + (20) - 2, .025) and -0.196652975524235 = (43.54653488820002 - 52.110090547734465) / 43.54653488820002 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```

### 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>


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Regressions in System.Tests.Perf_String Case Conversion #80245

Run Information