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DescriptionName
Allows processors to increase I/O performance by placing data
from I/O devices directly into the processor cache. This setting
helps to reduce cache misses. This can be one of the following:
• disabled—Data from I/O devices is not placed directly
into the processor cache.
• enabled—Data from I/O devices is placed directly into
the processor cache.
• Platform Default—The BIOS uses the value for this
attribute contained in the BIOS defaults for the server type
and vendor.
Direct Cache Access
Whether the system can enter a power savings mode during idle
periods. This can be one of the following:
• disabled—The system remains in high performance state
even when idle.
• enabled—The system can reduce power to system
components such as the DIMMs and CPUs.
• Platform Default—The BIOS uses the value for this
attribute contained in the BIOS defaults for the server type
and vendor.
We recommend that you contact your operating system vendor
to make sure the operating system supports this feature.
Processor C State
Allows the processor to transition to its minimum frequency
upon entering C1. This setting does not take effect until after
you have rebooted the server. This can be one of the following:
• disabled—The CPU continues to run at its maximum
frequency in C1 state.
• enabled—The CPU transitions to its minimum frequency.
This option saves the maximum amount of power in C1
state.
• Platform Default—The BIOS uses the value for this
attribute contained in the BIOS defaults for the server type
and vendor.
Processor C1E
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 387
Configuring BIOS Settings