This BIOS option allows the enabling/disabling of a processor mechanism to prefetch data into the cache according to a pattern-recognition algorithm In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.
This BIOS option allows the enabling/disabling of a processor mechanism to fetch the adjacent cache line within a 128-byte sector that contains the data needed due to a cache line miss. In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.
Enabling this option allows the processor cores to automatically increase its frequency and increasing performance if it is running below power, temperature.
Enabling this option allows to use processor resources more efficiently, enabling multiple threads to run on each core and increases processor throughput, improving overall performance on threaded software.
Values for this BIOS setting can be:
Efficiency: Maximize the power efficiency of the server.
Performance: Maximize the performance of the server.
Custom: Allows the user to setup all of the BIOS options according to their requirement.
Load Balance: The system's performance and consumption will be adjusted automatically according to the loading.
The Baseboard Management Controller allows the user to adjust the fan speed manually,If the server is in a stressful environment, the CPU have high temperature, you can adjust the fan speed to 100%.
Core C3, Core C6 can be disabled for latency-sensitive applications in order to minimize latency, but disable Core C-states can also significantly limit the amount of turbo when a low number of cores are active, C3 and C6 are recommended to enable in SPEC CPU benchmark.
Enable or disable reporting of the CPU C6 State (ACPI C3) to the OS.
When set to Enabled, the processor is allowed to switch to nimimum performance and save power when idle.
This BIOS option allows the enabling/disabling of Memory Periodic Patrol Scrubber. The Memory Periodic Patrol Scrubber corrects memory soft errors so that, over the length of the system runtime, the risk of producing multi-bit and uncorrectable errors is reduced.
This BIOS option controls the interleaving between the Integrated Memory Controllers (IMCs), Memory could be interleaved across sockets, memory controllers, DDR channels, Ranks. Memory is interleaved for performance and thermal distribution.
If IMC Interleaving is set to 2-way, addresses will be interleaved between the two IMCs.
If IMC Interleaving is set to 1-way, there will be no interleaving.
If IMC Interleaving is set to auto, it depends on the SNC (Sub NUMA Clustering) setting, when SNC is set to enbaled, the IMC Interleaving will be 1-way interleave, SNC is set to disabled, the IMC Interleaving will be 2-way interleave.
If SNC is disabled, IMC Interleaving should be set to 2-way. If SNC is enabled, IMC Interleaving should be set to 1-way.
SNC breaks up the last level cache (LLC) into disjoint clusters based on address range, with each cluster bound to a subset of the memory controllers in the system. SNC improves average latency to the LLC and memory. SNC is a replacement for the cluster on die (COD) feature found in previous processor families. For a multi-socketed system, all SNC clusters are mapped to unique NUMA (Non Uniform Memory Access) domains.
SNC AUTO supports 1-cluster or 2-clusters depending on IMC interleave. SNC and IMC interleave both AUTO will support 1-cluster 2-way IMC interleave.
SNC Enable supports Full SNC (2 clusters) and 1-way IMC interleave. Utilizes LLC capacity more efficiently and reduces latency due to core/IMC proximity. This may provide performance improvement on NUMA-aware operating systems.
SNC disable supports 1-cluster and 2-way IMC interleave, the LLC is treated as one cluster.
In some Intel CPU caching schemes, mid-level cache (MLC) evictions are filled into the last level cache (LLC). If a line is evicted from the MLC to the LLC, the core can flag the evicted MLC lines as "dead.” This means that the lines are not likely to be read again. This option allows dead lines to be dropped and never fill the LLC if the option is disabled.
Values for this BIOS option can be:
Disabled: Disabling this option can save space in the LLC by never filling MLC dead lines into the LLC.
Enabled: Opportunistically fill MLC dead lines in LLC, if space is available.
This option configures the processor last level cache (LLC) prefetch feature as a result of the non-inclusive cache architecture. The LLC prefetcher exists on top of other prefetchers that can prefetch data into the core data cache unit (DCU) and mid-level cache (MLC). In some cases, setting this option to disabled can improve performance. Typically, setting this option to enable provides better performance.
Values for this BIOS option can be:
Disabled: Disables the LLC prefetcher. The other core prefetchers are unaffected.
Enabled: Gives the core prefetcher the ability to prefetch data directly to the LLC.
The Xtended Prediction Table (XPT) prefetcher exists on top of other prefetchers that can prefetch data into the DCU, MLC, and LLC. The XPT prefetcher will issue a speculative DRAM read request in parallel to an LLC lookup. This prefetch bypasses the LLC, saving latency. In some cases, setting this option to disabled can improve performance. Typically, setting this option to enable provides better performance.
Values for this BIOS option can be:
Enabled: Allows a read request sent to the LLC to speculatively issue a copy of the read to DRAM.
Disabled: Read requests to the LLC are not allowed to send a speculative read to DRAM.
Adaptive Double Device Data Correction (ADDDC), which is an enhanced feature to DDDC. This function is used to correct data errors on two memory particles, ADDDC still has single-particle multi-bit error correction capability after the first particle failure occurs and is replaced.
Values for this BIOS option can be:
Enabled: Enable the ADDDC Sparing function.
Disabled: Disable the ADDDC Sparing function.