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為什麼添加兩個 Dimm 卡後配置的時脈速度會改變

tag-icon • tag-icon memory redhat-enterprise-linux kernel
為什麼添加兩個 Dimm 卡後配置的時脈速度會改變

我們有DELL硬體的Linux機器，並且機器有256G內存

在新增新的32G DIMM卡之前，我們驗證了它Configured Clock Speed是2400MHz

所以後來我們又增加了額外的32G（2張DIMM卡，與機器已有的相同的DIMM卡類型）到這台機器上，機器啟動後，我們檢查了by Configured Clock Speed，dmidecode發現它已經改變了

所以從Configured Clock Speed改為2400MHz1866 MHz

例子

在新增 DIMM 之前

dmidecode | grep "Configured Clock Speed"
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: 2133 MHz
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown

新增 DIMM 後

  Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: 1866 MHz
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown
        Configured Clock Speed: Unknown

那麼造成這種變化的原因可能是什麼？ ，為什麼加了一根dimm內存，然後就Configured Clock Speed變成這樣了呢？

Server is Dell PowerEdge R730 and memories are:

Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 16384 MB
    Form Factor: DIMM
    Set: 3
    Locator: A9
    Bank Locator: Not Specified
    Type: DDR4
    Type Detail: Synchronous Registered (Buffered)
    Speed: 2400 MHz
    Manufacturer: 002C0632002C
    Serial Number: 1B42681B
    Asset Tag: 001808A0
    Part Number: 18ASF2G72PDZ-2G3D1
    Rank: 2
    Configured Clock Speed: 1866 MHz
    Minimum Voltage:  1.2 V
    Maximum Voltage:  1.2 V
    Configured Voltage:  1.2 V

在此輸入影像描述

答案1

您的伺服器有 2 套，每套 12 個 DIMM 插槽。每組分為 4 個儲存通道。每個通道中的前兩個 DIMM 插槽支援高達 2400MHz 的速度，但第三個插槽僅支援 1866MHz。當您開始填滿第三個插槽時，所有速度都會降至系統上的最低速度。請查看使用手冊以了解更多詳細資訊。

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