文書番号: 000139282
Article Summary
This article provides information on how to solve the issue that the Operating Systems on the current PowerEdge servers may display less memory available than what is physically installed.
The message "missing memory" may be displayed when viewing available memory inside operating systems on PowerEdge server compared to the amount of physical memory installed.
This is likely due to UPI Prefetch and/or Sub NUMA Cluster being enabled. Thus, hardware does not need to be replaced.
UPI Prefetch: Enables you to get the memory read started early on DDR bus. The Ultra Path Interconnect (UPI) Rx path will spawn the speculative memory read to Integrated Memory Controller (iMC) directly. This option is set to Enabled by default.
This is a cache prefetching setting designed to boost execution performance. Instructions and data are pulled from original storage locations and stored in this prefetched cache. A small amount of RAM is required for prefetching.
Sub NUMA Cluster: Enables or disables the Sub NUMA Cluster. This option is set to Disabled by default.
This is an address-mapping mechanism designed to lower LLC and memory latency between memory controllers on processors. A small amount of RAM is required for this mapping.
In-depth details may be read about in the document from Intel.
PowerEdge FC640, PowerEdge M640, PowerEdge M640 (for PE VRTX), PowerEdge R440, PowerEdge R540, PowerEdge R640, PowerEdge R740, PowerEdge R740XD, PowerEdge R740XD2, PowerEdge R840, PowerEdge R940, PowerEdge R940xa, PowerEdge T440, PowerEdge T640
01 10月 2021
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