我在联想 x3550 M5 服务器。
操作系统是 Ubuntu 16.04.2 64 位uname -ra
Linux hostname 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
free -hm给出：
total used free shared buff/cache available
Mem: 7.2G 238M 6.5G 20M 474M 6.7G
Swap: 7.4G 0B 7.4G
并sudo lshw -c memory给出：
*-memory
description: System Memory
physical id: 5
slot: System board or motherboard
size: 16GiB
*-bank:0
description: DIMM Synchronous 2133 MHz (0.5 ns)
product: M393A2G40EB1-CPB
vendor: Samsung
physical id: 0
serial: 88045A3F
slot: Dimm 1
size: 16GiB
width: 64 bits
clock: 2133MHz (0.5ns)
其他银行都空了。
在 dmesg 中我没有看到任何异常：
dmesg | grep memory
[ 0.000000] Scanning 1 areas for low memory corruption
[ 0.000000] Base memory trampoline at [ffff880000096000] 96000 size 24576
[ 0.000000] Early memory node ranges
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x0009c000-0x0009ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x432a8000-0x4b2affff]
[ 0.000000] PM: Registered nosave memory: [mem 0x4bfdd000-0x4bfebfff]
[ 0.000000] PM: Registered nosave memory: [mem 0x646b2000-0x793fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x793ff000-0x7b3fefff]
[ 0.000000] PM: Registered nosave memory: [mem 0x7b3ff000-0x7b787fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x7b800000-0x8fffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x90000000-0xfed1bfff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed1c000-0xfed1ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfed20000-0xfeffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xff000000-0xffffffff]
[ 0.043027] Initializing cgroup subsys memory
[ 0.044460] Freeing SMP alternatives memory: 32K (ffffffff820b8000 - ffffffff820c0000)
[ 1.122178] Freeing initrd memory: 36936K (ffff8800337cc000 - ffff880035bde000)
[ 1.122674] Scanning for low memory corruption every 60 seconds
[ 2.616860] Freeing unused kernel memory: 1488K (ffffffff81f44000 - ffffffff820b8000)
[ 2.629739] Freeing unused kernel memory: 1792K (ffff880001840000 - ffff880001a00000)
[ 2.638571] Freeing unused kernel memory: 136K (ffff880001dde000 - ffff880001e00000)