# Sub-NUMA Clustering (SNC) Division of the memory and core of a CPU in an optimized fashion as to make sure to reduce the latency of memory calls [Sub-NUMA Clustering - frankdenneman.nl](https://frankdenneman.nl/2022/09/21/sub-numa-clustering/) # Resource Director Technology (RDT) A Big QoS (quality of services) system that manages cpu, cache and ram resources to be optimal in set scenarios [Intel® Resource Director Technology (Intel® RDT)](https://www.intel.com/content/www/us/en/architecture-and-technology/resource-director-technology.html) # Trust Domain Extensions (TDX) [[AMD/Terms#Secure Encrypted Virtualization (SEV)|AMD SEV]] For intel, memory protection for VMs [Trust Domain Extensions - Wikipedia](https://en.wikipedia.org/wiki/Trust_Domain_Extensions) # Performance Limit Reasons Gives you why the CPU isn't boosting to oblivion, current temp or anything else... [Intel Performance Limit Reasons Coming To Linux 6.11 - Phoronix](https://www.phoronix.com/news/Perf-Limit-Reasons-Linux-6.11) # Platform Monitoring Technology (PMT) Intel PMT is a standardized way of exposing telemetry through host-based and out-of-band access across client, server and companion products.[GitHub - intel/Intel-PMT](https://github.com/intel/Intel-PMT) # Efficiency Latency Control (ELC) ELC is a Frequency scaling feature that will seek to: 1. allow flooring of the frequency if CPU is used under a certain threshold (`elc_floor_freq_khz` and `elc_low_threshold_percent`) ex 800mhz if CPU doing nothing 2. allow maxing the frequency if CPU used over a certain threshold (`elc_high_threshold_percent`) ex 5ghz if CPU is 100% 3. all of that in 100mhz increment for best result ex cpu is at 50% at 2.6ghz so we don't move added to linux 6.12 [Intel Efficiency Latency Control "ELC" Feature Slated For Linux 6.12 - Phoronix](https://www.phoronix.com/news/Intel-Uncore-ELC-For-Linux-6.12) # In-Field Scan (IFS) added in linux 5.19 for Xeon Sapphire Rapids (2023) Check the whole CPU for defect in silicon. really useful for the part of the CPU which wouldn't have error correction/checking [Linux 5.19 Lands New Intel IFS Driver For Helping To Detect Faulty Silicon - Phoronix](https://www.phoronix.com/news/Intel-IFS-Lands-Linux-5.19) some existing scan inside IFS: Scan at Field (SAF) and ArrayBist ## Structural Based Functional Test at Field (SBAF) added with Intel Xeon 6 "Granite Rapids" (end 2024) and Linux 6.12 SBAF is part of IFS, it can work 1 core at a time and isolate that core while testing. SBAF test is also divided into multiple batches, and each batch test can take hundreds of milliseconds (100-200 ms) to complete. If such a lengthy interruption is undesirable, it is recommended to relocate the time-sensitive applications to other cores for the duration of the test. [Intel Granite Rapids Brings New "SBAF" Core Testing Capability - Phoronix](https://www.phoronix.com/news/Intel-Granite-Rapids-SBAF-IFS) # Hyper-Threading a type of Simultaneous multithreading (SMT), two thread to one core