If this field is set to (SEV ASID Count + 1), all ASIDs are forced to be SEV-ES ASIDs.Quick CPU is a powerful and easy to use software application for monitoring and optimizing the performance of your computer. ASIDs from SEV-ES ASID Space Limit to (SEV ASID Count + 1) can only be used with SEV VMs. SEV VMs using ASIDs below the SEV-ES ASID Space Limit must enable the SEV-ES feature. 16TB of physical address space is available for systems that support 253 ASIDs, while 8TB of physical address space is available for systems that support 509 ASIDs. This fields specifies the maximum valid ASID, which affects the maximum system physical address space. cTDP is only configurable before OS boot. If a manual value is entered that is larger than the max value allowed, the value will be internally limited to the maximum allowable value. Maximum sets the maximum allowed cTDP value for the installed CPU SKU. Auto sets cTDP =TDP for the installed CPU SKU. Sets the maximum power consumption for the CPU. Disabling TSME will result in a small decrease to memory latency.Įnables or disables the IO based C-state generation and DF C-states control.Īuto: Use default performance determinism settings. TSME provides hardware memory encryption for all data stored in system memory. If all 4 related settings are 'Enable', it is effectively equivalent to Secured-core being 'Enable'.Įnable DMAr system protection during POST.Įnable or Disable Transparent Secure Memory Encryption. When Secured-core is 'Custom', the related settings can be changed independently as needed. When Secured-core is 'Enable', the 4 related settings are 'Enable' and locked. (ERMSB) Can be disabled for analysis purposes as long as OS supports it.Įnable Secured-Core support. (FSRM) Can be disabled for analysis purposes as long as OS supports it. Auto uses x2APIC only if 256 hardware threads are in the system. x2APIC scales beyond 255 hardware threads but is not supported by some legacy OS versions. xAPIC scales to only 255 hardware threads. LCLK Frequency Control (For 3rd Gen CPU only)ĪPIC mode. (Note: Setting 'LCLK Freq Control' on the same Root Complex which the Preferred IO Bus belongs to, to anything other than 'Auto' will override the Enhanced Preferred IO Mode.) When the item Preferred IO Bus set to the preferred I/O device bus number, you will see this item.Įnhanced Preferred IO Mode (For 3rd Gen CPU only)Įnabling the Enhanced Preferred I/O mode assures an LCLK valuate for best performance. When a specific bus is selected for higher IO priority, the format of the field is XX, where XX is the bus number in hex (For Redfish, the bus number is in decimal). When No Priority is selected, there is no preferred IO bus. Some workloads may benefit from having it disabled. Use memory access history to determine whether to fetch the next or previous line for all memory accesses. Some workloads may benefit from having it disabled.Įnable or disable the L2 Stream HW Prefetcher. Some workloads may benefit from having it disabled.įetch additional data lines into L1 cache when the data access for a given instruction tends to be followed by a consistent pattern of subsequent accesses. Use memory access history to fetch additional data lines into L1 cache when each access is a constant distance from the previous. The total number of activated cores is limited by the maximum number of cores of the installed CPU SKU.Įnable or disable the L1 Stream HW Prefetcher. Dies Per CPU is in the CPU1 Information page. Total activated cores = # Cores Per Die * Dies Per CPU * Number of Installed CPUs. The value entered applies to all cores.Īuto | 1 Cores Per Die | 2 Cores Per Die | 3 Cores Per Die | 4 Cores Per Die | 5 Cores Per Die | 6 Cores Per Die | 7 Cores Per Die Specify the boost Fmax frequency, the value entered is a 4 digit number representing the maximum boost frequency in MHz. When a manual value is entered, the value entered is a 4 digit number representing the maximum boost frequency in MHz. Auto set the boost frequency to the fused value for the installed CPU. To re-enable SMT, a POWER CYCLE is needed after selecting Enable.ĬPPC (cooperative processor performance control) is a way for the OS to influence the performance of a CPU on a contiguous and abstract scale without knowledge of power budgets or discrete processor frequencies. Press to view the information related to CPU 1.Ĭan be used to disable symmetric multithreading.
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