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High CPU usage after update to DSS V7 up53

Article ID: 2741
Last updated: 18 Nov, 2015


- high cpu usage after update to the DSS V7 up53,

- multicore CPU visible as one core CPU in the log file: tests.log


- turning off X2APIC settings in the mainboard BIOS, X2APIC is not supported by DSS kernel

Problem occured on HP GEN9 server but it is recommended to turn of X2APIC settings on other systems also.

Table 1. Recommended low-latency settings for Linux environmentsParameter




Intel Virtualization Technology (pre-UEFI menu)

Virtualization Technology (UEFI menu)


Allows Virtual Machine Managers to utilize virtualization hardware capabilities

Intel Hyperthreading Options


Allows Hyperthreading, which adds logical cores but increases computational jitter

Intel Turbo Boost Technology


Allows processors to make a transition to a frequency that is higher than its rated speed. For more information, see “Turbo mode information and considerations” on page 10.

Intel VT-d


Enables virtualized Directed I/O

Thermal Configuration

First try Optimal Cooling, then repeat with Increased Cooling and then Max Cooling (if available)*

Steps through the different available cooling settings available in RBSU. Use the one that provides the desired performance for the lowest power consumption. For more information, see “Thermal considerations” on page 11.

HP Power Profile

Maximum Performance

Disables all power management options that may negatively affect performance

HP Power Regulator

HP Static High Performance Mode

Keeps processors in their maximum power/performance state (automatically set by HP Power Profile for Gen 8 and Gen 9 servers)

Intel QPI Link Power Management


Precludes placing unutilized QPI links into low power state

Minimum Processor Idle Power Core State

No C-States

Precludes processor transitions into low-power core C-States (automatically set by HP Power Profile for Gen 8 and Gen 9 servers)

Minimum Processor Idle Power Package State

No Package State

Precludes processor transitions into low-power package C-States (automatically set by HP Power Profile for Gen 8 and Gen 9 servers)

Energy/Performance Bias

Maximum Performance

Configures processor subsystems for high-performance/low-latency (automatically set by HP Power Profile for Gen 8 and Gen 9 servers)

Collaborative Power Control


Precludes the OS from changing clock frequency (automatically set by HP Power Profile for Gen 8 and Gen 9 servers)

DIMM Voltage Preference

Optimized for Performance

Runs DIMMs at a higher voltage if it increases performance. (Gen 8 only)

Dynamic Power Capping Functionality


This option allows for disabling System ROM Power Calibration during the boot process.

Doing so accelerates boot times but precludes enabling of a Dynamic Power Cap. (Gen 8 and Gen 9 only)

Table 1. Recommended low-latency settings for Linux environments, continued.

Memory Power Savings


Maximum Performance

This option configures several memory parameters to optimize the memory subsystems performance and is configured to Balanced by default. (Gen 8 only)

QPI Snoop Configuration

Early Snoop or Cluster on Die**

This option allows for the configurations of different snoop modes that impact the QPI interconnect. Changing this option may improve performance in certain workloads. Home Snoop provides high-memory bandwidth in an average NUMA environment (default setting). Cluster on Die may provide increased memory bandwidth in highly optimized NUMA workloads. Early Snoop may decrease memory latency but may also result in lower overall bandwidth as compared to other modes. (Gen 9 only)

ACPI SLIT Preferences


This ACPI SLIT describes the relative access times between processors, memory subsystems, and I/O subsystems. Operating systems that support the SLIT can use this information to improve performance by allocating resources and workloads more efficiently. This option is disabled by default on most ProLiant Gen 8 and Gen 9 servers.

Processor Power and Utilization Monitoring


Disables iLO Processor State Mode Switching and Insight Power Manager Processor Utilization Monitoring, and its associated SMI

Memory Pre-Failure Notification


Disables Memory Pre-Failure Notification and its associated SMI

Memory Patrol Scrubbing


Memory Periodic Patrol Scrubber corrects memory soft errors so that, over the length of the system runtime, the risk of producing multi-bit and uncorrectable errors is reduced.

Memory Refresh Rate

1x Refresh***

This option controls the refresh rate of the memory controller. The default value for this parameter is 2x.


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Article ID: 2741
Last updated: 18 Nov, 2015
Revision: 1
Views: 2601
Posted: 18 Nov, 2015 by Stolarczyk M.
Updated: 18 Nov, 2015 by Rafinski G.
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