Lenovo ThinkSystem SD530 Manual page 37

Table 11. Processors details (continued)
Energy Efficient Turbo
Uncore Frequency Scaling
MONITOR/MWAIT
UPI Link Disable
SNC
Snoop Preference
When energy efficient turbo is enabled, the CPU's optimal
• Enable
turbo frequency will be tuned dynamically based on CPU
• Disable
utilization. The power/performance bias setting also
influences energy efficient turbo. When a preset mode is
selected, the low-level settings are not changeable and
will be grayed out. If user would like to change the
settings, please choose [Custom Mode] in "Operating
Mode" and [Enable] in "Turbo Mode" located under
"System Setting" submenu.
Enable is the default setting.
When enabled, the CPU uncore will dynamically change
• Enable
speed based on the workload. All miscellaneous logic
• Disable
inside the CPU package is considered to be the uncore.
Enable is the default setting.
MONITOR/MWAIT instructions are used to engage C-
• Enable
states. Some operating systems will re-enable C-states
• Disable
even when they are disabled in setup. To prevent this,
disable MONNITOR/MWAIT. Please choose [Custom
Mode] in "Operating Mode" and [Disable] in "C-States"
located under "System Setting" submenu.
Enable is the default setting.
This item can be changed after the steps as below.
• 1. Operating Modes -> Custom
• 2. C-states -> Disable
Disabling one of the CPU UPI links can save power. If
• Enable All Links
maximum performance is desired, all UPI links should be
• Disable 1 Link
left enabled. When a preset mode is selected, the low-
level settings are not changeable and will be grayed out. If
user would like to change the settings, please choose
[Custom Mode] in "Operating Mode" located under
"System Setting" submenu.
Enable All Links is the default setting.
SNC (sub NUMA cluster) partitions the cores and last
• Enable
level cache into clusters with each cluster bound to a set
• Disable
of memory controllers in the system. SNC improves
average latency to the last level cache.
Disable is the default setting.
Select the appropriate snoop mode based on the
• Home Snoop
workload. Setting the snoop mode preference does not
Plus
always guarantee that it will be selected. The mode will be
• Home Snoop
changed if the current hardware configuration does not
support the desired mode. Also not that SNC has priority
over the snoop mode.
Home Snoop Plus is the default setting.
.
Chapter 3 System configuration and boot management
33