我有一个安装了 16GB RAM 的 threadripper 系统。 BIOS 显示两条 8GB 内存条。
dmidecode 显示了两个内存条，但 free -m 和 top 仅显示 7899mb 的可用内存。
root@threadripper-1:~# free -m
total used free shared buff/cache available
Mem: 7899 501 7112 1 285 7142
Swap: 0 0 0
root@threadripper-1:~# dmidecode -t memory
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 3.0.0 present.
Handle 0x000E, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 512 GB
Error Information Handle: 0x000D
Number Of Devices: 4
Handle 0x0015, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000E
Error Information Handle: 0x0014
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL A
Type: Unknown
Type Detail: Unknown
Speed: Unknown
Manufacturer: Unknown
Serial Number: Unknown
Asset Tag: Not Specified
Part Number: Unknown
Rank: Unknown
Configured Clock Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
Handle 0x0017, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000E
Error Information Handle: 0x0016
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL B
Type: Unknown
Type Detail: Unknown
Speed: Unknown
Manufacturer: Unknown
Serial Number: Unknown
Asset Tag: Not Specified
Part Number: Unknown
Rank: Unknown
Configured Clock Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
Handle 0x0019, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000E
Error Information Handle: 0x0018
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL C
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 2133 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3200C16-8GTZR
Rank: 1
Configured Clock Speed: 2133 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Handle 0x001B, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000E
Error Information Handle: 0x001A
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL D
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 2133 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: F4-3200C16-8GTZR
Rank: 1
Configured Clock Speed: 2133 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
关于如何获得完整的 16GB 可用空间有什么想法/建议吗？
根据要求添加 cat /proc/meminfo
ukcsgo@threadripper-1:~$ cat /proc/meminfo
MemTotal: 8089456 kB
MemFree: 7275396 kB
MemAvailable: 7307992 kB
Buffers: 30220 kB
Cached: 192672 kB
SwapCached: 0 kB
Active: 144488 kB
Inactive: 126140 kB
Active(anon): 49204 kB
Inactive(anon): 156 kB
Active(file): 95284 kB
Inactive(file): 125984 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 276 kB
Writeback: 16 kB
AnonPages: 47784 kB
Mapped: 52872 kB
Shmem: 1628 kB
Slab: 374160 kB
SReclaimable: 73044 kB
SUnreclaim: 301116 kB
KernelStack: 9088 kB
PageTables: 4240 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 4044728 kB
Committed_AS: 768268 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 190504 kB
DirectMap2M: 3883008 kB
DirectMap1G: 4194304 kB