AWS AWSEC2: Clarify PV driver troubleshooting steps and IO bottleneck explanation
Summary
Updated wording for clarity in registry editing steps and refined explanations about IO bottleneck conditions.
Security assessment
Changes involve UI instruction clarity and grammatical improvements without security implications.
Evidence
+ 12. For each key, open **UpperFilters** , enter a value of XENFILT, and then choose **OK**.
Diff
diff --git a/AWSEC2/latest/UserGuide/pvdrivers-troubleshooting.md b/AWSEC2/latest/UserGuide/pvdrivers-troubleshooting.md index d3c184594..477e9fcb7 100644 --- a//AWSEC2/latest/UserGuide/pvdrivers-troubleshooting.md +++ b//AWSEC2/latest/UserGuide/pvdrivers-troubleshooting.md @@ -127 +127 @@ If you do not create the instance in the same Availability Zone as the affected - 12. For each key, double-click **UpperFilters** , enter a value of XENFILT, and then choose **OK**. + 12. For each key, open **UpperFilters** , enter a value of XENFILT, and then choose **OK**. @@ -225 +225 @@ Disabling TCP offloading may reduce the network performance of your instance. - 5. Right-click **Citrix PV Ethernet Adapter #0** and select **Properties**. + 5. Open the context (right-click) menu for **Citrix PV Ethernet Adapter #0** and select **Properties**. @@ -257 +257 @@ You can be affected by this issue if you are using Windows instances running AWS -Disk reads and writes (IOs) in the AWS PV drivers occur in two phases: **IO preparation** and **IO completion**. By default, the preparation phase runs on a single arbitrary core. The completion phase runs on core `0`. The amount of computation required to process an IO varies based on it size and other properties. Some IOs use more computation in the preparation phase, and others in the completion phase. When an instance drives more than 20,000 IOPS, the preparation or completion phase may result in a bottleneck, where the CPU upon which it runs is at 100% capacity. Whether or not the preparation or completion phase becomes a bottleneck depends on the properties of the IOs used by the application. +Disk reads and writes (IOs) in the AWS PV drivers occur in two phases: **IO preparation** and **IO completion**. By default, the preparation phase runs on a single arbitrary core. The completion phase runs on core `0`. The amount of computation required to process an IO varies based on it size and other properties. Some IOs use more computation in the preparation phase, and others in the completion phase. When an instance drives more than 20,000 IOPS, the preparation or completion phase may result in a bottleneck, where the CPU upon which it runs is at 100% capacity. Whether the preparation or completion phase becomes a bottleneck depends on the properties of the IOs used by the application. @@ -289 +289 @@ You can use Windows Task Manager to view the load on each CPU to determine poten - 8. Right-click on the graph in the main pane and select **Change graph to** >**Logical processors** to display each individual core. + 8. Open the context (right-click) menu for the graph in the main pane and select **Change graph to** >**Logical processors** to display each individual core. @@ -304 +304 @@ Default configuration | Workload is driving less than 20,000 IOPS, or other conf -Allow driver to choose whether to distribute completion | Workload is driving more than 20,000 IOPS and moderate or high load is observed on core `0`. | This configuration is recommended for all Xen instances using PV 8.4.0 or later and leveraging more than 20,000 IOPS, whether or not problems are encountered. +Allow driver to choose whether to distribute completion | Workload is driving more than 20,000 IOPS and moderate or high load is observed on core `0`. | This configuration is recommended for all Xen instances using PV 8.4.0 or later and leveraging more than 20,000 IOPS, whether problems are encountered. @@ -349 +349 @@ Allow driver to choose whether to distribute completion -Set `NotiferDistributed` registry key to allow the PV storage driver to choose whether or not to distribute IO completion. +Set `NotiferDistributed` registry key to allow the PV storage driver to choose whether to distribute IO completion.