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总内存低于实际内存量

tag-icon • tag-icon linux memory 64-bit arch-linux
总内存低于实际内存量

uname -a：Linux amro 5.1.14-arch1-1-ARCH #1 SMP PREEMPT Sat Jun 22 16:28:48 UTC 2019 x86_64 GNU/Linux

我买了一根 8GB 的​​内存条，但 KSysGuard 说总共有 5.8GB。

/proc/meminfo 显示它是 6gb

MemTotal:        6113940 kB

免费-m

             total        used        free      shared  buff/cache   available
Mem:           5970        1832        2567         151        1569        3709
Swap:          1023           0        1023

然而，dmidecode 给出了正确的值

dmidecode -t 内存

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.

Handle 0x000F, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 256 GB
    Error Information Handle: 0x000E
    Number Of Devices: 2

Handle 0x0016, DMI type 17, 40 bytes
Memory Device
    Array Handle: 0x000F
    Error Information Handle: 0x0015
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 8192 MB
    Form Factor: DIMM
    Set: None
    Locator: DIMM 0
    Bank Locator: P0 CHANNEL A
    Type: DDR4
    Type Detail: Synchronous Unbuffered (Unregistered)
    Speed: 2133 MT/s
    Manufacturer: Unknown
    Serial Number: 00000000
    Asset Tag: Not Specified
    Part Number: CMK8GX4M1D3000C16   
    Rank: 1
    Configured Memory Speed: 1067 MT/s
    Minimum Voltage: 1.2 V
    Maximum Voltage: 1.2 V
    Configured Voltage: 1.2 V

这是正常的吗？还是我的内存条有问题？谢谢帮助。

更多信息

dmidecode -t 基板

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
    Manufacturer: Micro-Star International Co., Ltd.
    Product Name: B450M GAMING PLUS (MS-7B87)
    Version: 1.0
    Serial Number: J216413997
    Asset Tag: To be filled by O.E.M.
    Features:
        Board is a hosting board
        Board is replaceable
    Location In Chassis: To be filled by O.E.M.
    Chassis Handle: 0x0003
    Type: Motherboard
    Contained Object Handles: 0

Handle 0x0033, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Broadcom 5762
    Type: Ethernet
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:16:00.0

Handle 0x0034, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Realtek ALC898
    Type: Sound
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:38:00.6

(@Señor CMasMas 提到它可能是共享图形内存，因为我正在使用 iGPU，所以我想可能是这种情况。)

sudo dmesg | grep VRAM

[    3.849314] amdgpu 0000:38:00.0: VRAM: 2048M 0x000000F400000000 - 0x000000F47FFFFFFF (2048M used)
[    3.849321] [drm] Detected VRAM RAM=2048M, BAR=2048M
[    3.849438] [drm] amdgpu: 2048M of VRAM memory ready

答案1

感谢@SeñorCMasMas 和@NatalieAdams 帮助我解决这个问题

问题在于 2GB 被用作共享图形内存。我通过更改 BIOS 中的缓冲区大小并将其调低来检查这个问题。

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