PowerEdge：在 PowerEdge 伺服器上，作業系統顯示的可用記憶體可能少於實際安裝的記憶體
Summary: 本文說明在 PowerEdge 伺服器上，作業系統顯示的可用記憶體少於實際安裝記憶體的問題。
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Symptoms
問題
在 PowerEdge 伺服器上的作業系統內檢視可用記憶體，並與所安裝的實體記憶體比較時，可能會顯示「遺失記憶體」訊息。
Cause
N/A
Resolution
解決方案
這可能是因為已啟用 UPI 預先擷取和/或 Sub NUMA 叢集。因此不需要更換硬體。
注意：這兩個項目都可在處理器設定下的「F2 系統設定」中找到。
- UPI 預先擷取：可讓您取得 DDR 匯流排上提早啟動的記憶體讀取。Ultra Path Interconnect （UPI） Rx 路徑會將推測性記憶體讀取直接繁衍至整合式記憶體控制器 （iMC）。此設定預設為啟用。
- 這是一種快取預先擷取設定，目的為提升執行效能。會從原始儲存位置提取指示和資料，並儲存在此預先擷取快取中。預先擷取需要少量的 RAM。
- Sub NUMA 叢集：啟用或停用 Sub NUMA 叢集。此選項預設為停用。
- 這是一種位址對應機制，目的是降低處理器上記憶體控制器間的 LLC 和記憶體延遲。此對應需要少量的 RAM。
您可以閱讀這份 Intel 文件
停用這兩個項目可還原大部分遺失的記憶體，但可能會降低效能。
Affected Products
Poweredge C4140, PowerEdge C6420, PowerEdge C6520, PowerEdge FC640, PowerEdge M640, PowerEdge M640 (for PE VRTX), PowerEdge MX740C, PowerEdge MX750c, PowerEdge MX840C, PowerEdge R350, PowerEdge R440, PowerEdge R450, PowerEdge R540, PowerEdge R550
, PowerEdge R640, PowerEdge R650, PowerEdge R650xs, PowerEdge R740, PowerEdge R740XD, PowerEdge R740XD2, PowerEdge R750, PowerEdge R750XA, PowerEdge R750xs, PowerEdge R7515, PowerEdge R7525, PowerEdge R840, PowerEdge R940, PowerEdge R940xa, PowerEdge T350, PowerEdge T440, PowerEdge T550, PowerEdge T640, PowerEdge XE2420, PowerEdge XE7420, PowerEdge XE7440
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Article Properties
Article Number: 000139282
Article Type: Solution
Last Modified: 15 Apr 2025
Version: 4
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