Operating Modes
The ThinkSystem SR635 and SR655 servers offer two preset operating modes, Maximum Efficiency and Maximum Performance. These modes are a collection of predefined low-level UEFI settings that simplify the task of tuning the server for either maximum performance or energy efficiency.
Use the following submenu to set the operating mode.
For more information, refer to Tuning UEFI Settings for Performance and Energy Efficiency on Lenovo ThinkSystem SR635 and SR655 Servers at https://lenovopress.com/lp1267-tuning-uefi-for-performance-energy-efficiency-sr635-sr655.
| Submenu item | Options | Description |
|---|---|---|
| Set Operating Mode | Maximum Efficiency | Maximum Performance | Select the operating mode based on your preference. |
| Operating Mode | N/A | Display the operating mode that you set. |
| Determinism Slider | Auto | Power | Performance | Auto = Use default performance determinism settings The default option is Power. |
| Core Performance Boost | Disable | Auto | Disable Core Performance Boost. The default option is Auto. |
| cTDP Control | Manual | Auto | Manual = User can set customized cTDP Auto = Use the fused cTDP The default option is Auto |
| cTDP | 0 | cTDP [W] 0 = Invalid value. |
| Memory Speed | Auto| 2933 MHz | 2666 MHz | 2400 MHz | Select the desired memory speed or Auto. The default option is 2933 MHz |
| L1 Stream HW Prefetcher | Disable | Enable | Auto | Enable or disable the L1 Stream HW Prefetcher. The default option is Auto. |
| L2 Stream HW Prefetcher | Disable | Enable | Auto | Enable or disable the L2 Stream HW Prefetcher. The default option is Auto. |
| Global C-state Control | Disable | Enable | Auto | Enables or disables for IO based C-state generation and DF C-states control. The default option is Enable. |
| SMT Mode | Disable | Auto | Disable symmetric multithreading. To re-enable SMT, a POWER CYCLE is needed after selecting the Auto option. The default option is Auto. |
| Memory Interleaving | Disable | Auto | Disable the memory interleaving. The default option is Auto. |
| NUMA nodes per socket | NPS0 | NPS1 | NPS2 | NPS4 | Auto | Specify the number of desired NUMA nodes per socket. NPS0 means to interleave the two sockets together. The default option is NPS1. |
| EfficiencyModeEn | Auto | Enable | Enable the Efficiency Mode. The default option is Enable. |
| Package Power Limit Control | Manual | Auto | Manual = Set the customized PPT. Auto = Use the fused Package Power Limit (PPT). The default option is Auto. |
| Package Power Limit | 0 | PPT [W] |
| Chipselect Interleaving | Disable | Auto | Interleave memory blocks across the DRAM chip selects for node 0. The default option is Auto. |
| LLC as NUMA Node | Disable | Enable | Auto | Enable or disable the performance for highly NUMA optimized workloads. The default option is Auto. |