HP BL460c Configuring the HP ProLiant Server BIOS fo Low Latency OS Kernel Env - Page 4

Overview - g6 memory configuration

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Overview BIOS latency Some application environments, such as data acquisition and processing in specific financial trading environments, require predictable and minimal program execution and system response times. Operating system kernels specifically designed and tuned for low latency can provide the required system response. BIOS support for some system management features can result in increased maximum latency. This increase in maximum latency can result in an unacceptable guaranteed system response in these specific environments. To improve the guaranteed system response where a low-latency OS kernel is installed, BIOS ROMs for HP ProLiant 200 Series and above G5 and G6 servers provide a means to disable some HP system management features. While these HP system management features do not negatively affect system performance and system bandwidth, they may increase latency and thus increase the maximum latency of the system. Disabling system management features is necessary only when the absolute minimum latency is required. d. IMPORTANT: The configuration changes described in this document apply only to systems with a low latency OS kernel installed. Overall system throughput is not affected, whether or not the system management features are enabled. Before you begin Configuring BIOS for minimum latency causes some server features to become unavailable. Before reconfiguring BIOS, be sure that none of the features described below are required: • Disabling Processor Power and Utilization Monitoring, which disables system management functionality interrupts, disables the following features: o iLO 2 Processor State Monitoring o Insight Power Manager CPU Utilization Reporting o HP Dynamic Power-Savings Mode • Disabling Memory Pre-Failure Notification has the following effects: o Disables Memory Pre-Failure Warranty Support o Disables notification when correctable memory errors above a pre-defined threshold occur o Forces the system to run in Advanced ECC Mode, regardless of the mode configured in RBSU IMPORTANT: Online Spare Mode, Mirroring Mode, and Lock-step Mode are not supported when Memory Pre-Failure Notification support is disabled. Supported AMP modes depend on the generation and model of the ProLiant server. Overview 4

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Overview 4
Overview
BIOS latency
Some application environments, such as data acquisition and processing in specific financial trading
environments, require predictable and minimal program execution and system response times. Operating
system kernels specifically designed and tuned for low latency can provide the required system response.
BIOS support for some system management features can result in increased maximum latency. This
increase in maximum latency can result in an unacceptable guaranteed system response in these specific
environments.
To improve the guaranteed system response where a low-latency OS kernel is installed, BIOS ROMs for
HP ProLiant 200 Series and above G5 and G6 servers provide a means to disable some HP system
management features. While these HP system management features do not negatively affect system
performance and system bandwidth, they may increase latency and thus increase the maximum latency of
the system. Disabling system management features is necessary only when the absolute minimum latency
is required.
d.
IMPORTANT:
The configuration changes described in this document apply only to systems with
a low latency OS kernel installed. Overall system throughput is not affected, whether or not the
system management features are enabled.
Before you begin
Configuring BIOS for minimum latency causes some server features to become unavailable. Before
reconfiguring BIOS, be sure that none of the features described below are required:
•
Disabling Processor Power and Utilization Monitoring, which disables system management
functionality interrupts, disables the following features:
o
iLO 2 Processor State Monitoring
o
Insight Power Manager CPU Utilization Reporting
o
HP Dynamic Power-Savings Mode
•
Disabling Memory Pre-Failure Notification has the following effects:
o
Disables Memory Pre-Failure Warranty Support
o
Disables notification when correctable memory errors above a pre-defined threshold occur
o
Forces the system to run in Advanced ECC Mode, regardless of the mode configured in RBSU
IMPORTANT:
Online Spare Mode, Mirroring Mode, and Lock-step Mode are not supported
when Memory Pre-Failure Notification support is disabled.
Supported AMP modes depend on
the generation and model of the ProLiant server.