NEC Express5800/R120h-2M Maintenance Manual page 97

Chapter 2 Useful Features
Option
Energy/Performance
Bias
Collaborative Power
Control
Intel DMI Link Frequency
NUMA Group Size
Optimization
Intel Performance
Monitoring Support
Uncore Frequency
Scaling
Sub- NUMA Clustering
Parameter
Maximum Performance
[Balanced Performance]
Balanced Power
Power SavingMode
[Enabled]
Disabled
[Auto]
Gen 1 Speed
Gen 2 Speed
[Flat]
Clustered
[Disabled]
Enabled
[Auto]
Maximum
Minimum
Enabled
[Disabled]
Express5800/R120h-1M, R120h-2M Maintenance Guide
Description
You can only configure this option if the Workload
Profile is set to Custom. Use this option to
configure several processor subsystems to
optimize the performance and power usage of the
processor. Balanced Performance provides
optimum power efficiency, and is recommended for
most environments. Maximum Performance Mode
is recommended for environments that require the
highest performance and lowest latency but are not
sensitive to power consumption. Only use Power
Savings Mode in environments that are power
sensitive and can accept reduced performance.
For operating systems that support the Processor
Clocking Control (PCC) Interface, enabling this
option enables the Operating System to request
processor frequency changes even if the Power
Regulator option on the server are configured for
Dynamic Power Savings Mode. For Operating
Systems that do not support the PCC Interface, or
when the Power Regulator Mode is not configured
for Dynamic Power Savings Mode, this option has
no effect on system operation.
Use this option to force the link speed between the
processor and the southbridge to run at slower
speeds to save power.
Use this option to configure how the System BIOS
reports the size of a NUMA node (number of logical
processors), which assists the Operating System in
grouping processors for application use (referred to
as Kgroups). The default setting of Clustered
provides better performance due to optimizing the
resulting groups along NUMA boundaries.
However, some applications might not be optimized
to take advantage of processors spanning multiple
groups. In such cases, selecting the Flat option
might be necessary in order for those applications
to utilize more logical processors.
This option does not impact performance. When
enabled, this option exposes certain chipset
devices that can be used with the Intel
Performance Monitoring Toolkit.
This option controls the frequency scaling of the
processor's internal busses (the uncore.) Setting
this option to Auto enables the processor to
dynamically change frequencies based on
workload. Forcing to the maximum or minimum
frequency enables tuning for latency or power
consumption.
When enabled, Sub-NUMA Clustering divides the
processor's cores, cache, and memory into multiple
NUMA domains. Enabling this feature can increase
performance for workloads that are NUMA aware
and optimized. Note: When this option is enabled,
up to 1GB of system memory may become
unavailable.
1. System Utilities
97