An engineer is seeking the most optimal on demand CPU performance while configuring the BIOS settings of a UCS C-series rack mount server. What setting will accomplish this goal?
My vote is for D. Cobra_kai's reference gives the correct information but the question isn't about how to save the most power - which would be C6 Retention - but what's most suitable for on-demand compute. This means transitioning back to high performance as quickly as possible. So the answer would be C0/C1.
C6 Nonretention: When the CPU is idle, the system reduces power consumption more than with the C3 option. This option saves more power than C0, C1, or C3, but the system may experience performance problems until the server returns to full power.
● C6 Retention: When the CPU is idle, the system reduces power consumption more than with the C3 option. This option consumes slightly more power than the C6 Nonretention option, because the processor is operating at Pn voltage to reduce the package’s C-state exit latency.
C0 C1 State—The server provides all server components with full power at all times. This option maintains the highest level of performance and requires the greatest amount of power.
C0/C1 State: When the CPU is idle, the system slightly reduces power consumption. This option requires less power than C0 and allows the server to return quickly to high-performance mode.
C0/C1 State: When the CPU is idle, the system slightly reduces power consumption. This option requires less power than C0 and allows the server to return quickly to high-performance mode.
This setting allows the CPU to operate at its highest performance states (C0 and C1), which means that the CPU will be active and ready to process tasks with minimal latency. This configuration is suitable for applications and workloads that require maximum CPU performance and responsiveness.
I think it should be D C0/C2 because the question is related to performance on demand.
When we are working on demand, we really do not know when we will have a spike and need to answer the requests quickly so working on C0/C1 will be suitable for this case.
C0 state—The server provides all server components with full power at all times. This option maintains the highest level of performance and requires the greatest amount of power.
C1 state—When the CPU is idle, the system slightly reduces the power consumption. This option requires less power than C0 and allows the server to return quickly to high-performance mode.
While C3, C6, and C7 could cause performance issues until the server returns to full power and it is not suitable for on-demand.
Correct Answer: C6 Retention
Reference: https://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/white-paper-c11-744678.html. For Package C State limit default: C0/C1 State; Max Per: Platform Default; Low-latenc: Platform Default; Energy Effi: C6 Retention
Answer should be D
Allows you to determine whether system performance or energy efficiency is more important on this server. This can be one of the following:
Performance — The server provides all server components with full power at all times. This option maintains the highest level of performance and requires the greatest amount of power.
Reference: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/gui/config/guide/4_0/b_Cisco_UCS_C-series_GUI_Configuration_Guide_40/b_Cisco_UCS_C-series_GUI_Configuration_Guide_40_appendix_010011.html
Ans is A
https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/whitepaper_c11-740098.pdf
he higher the package C-state, the lower the power use of that idle package state. The default setting, Package C6 (nonretention), is the lowest power idle package state supported by the processor.
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/gui/config/guide/4_0/b_Cisco_UCS_C-Series_GUI_Configuration_Guide_for_S3260_Servers_40/b_Cisco_UCS_C-Series_GUI_Configuration_Guide_for_S3260_Servers_40_appendix_010011.html
"Whether the BIOS sends the C6 report to the operating system. When the OS receives the report, it can transition the processor into the lower C6 power state to decrease energy usage while maintaining optimal processor performance"
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