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标题: 4GB物理内存，top后只显示256M，为何？ [打印本页]

作者: huifeideluotuo 时间: 2011-10-21 16:22
标题: 4GB物理内存，top后只显示256M，为何？
物理内存信息如下：
[root@localhost ~]# /usr/sbin/dmidecode | grep -A 16 "Memory Device"
Memory Device
      Array Handle: 0x1000
      Error Information Handle: Not Provided
      Total Width: 72 bits
      Data Width: 64 bits
      Size: 1024 MB
      Form Factor: DIMM
      Set: 1
      Locator: DIMM1_A
      Bank Locator: Not Specified
      Type: DDR2
      Type Detail: Synchronous
      Speed: 667 MHz
      Manufacturer: 7F7F7F0B00000000
      Serial Number: 8844153F
      Asset Tag: 0D0802
      Part Number: NT1GT72U8PA1BY-3C
--
Memory Device
      Array Handle: 0x1000
      Error Information Handle: Not Provided
      Total Width: 72 bits
      Data Width: 64 bits
      Size: 1024 MB
      Form Factor: DIMM
      Set: 1
      Locator: DIMM1_B
      Bank Locator: Not Specified
      Type: DDR2
      Type Detail: Synchronous
      Speed: 667 MHz
      Manufacturer: 7F7F7F0B00000000
      Serial Number: 3145153E
      Asset Tag: 0D0802
      Part Number: NT1GT72U8PA1BY-3C
--
Memory Device
      Array Handle: 0x1000
      Error Information Handle: Not Provided
      Total Width: 72 bits
      Data Width: 64 bits
      Size: 1024 MB
      Form Factor: DIMM
      Set: 2
      Locator: DIMM2_A
      Bank Locator: Not Specified
      Type: DDR2
      Type Detail: Synchronous
      Speed: 667 MHz
      Manufacturer: CE00000000000000
      Serial Number: 231B99EC
      Asset Tag: 010768
      Part Number: M3 91T2953EZ3-CE6
--
Memory Device
      Array Handle: 0x1000
      Error Information Handle: Not Provided
      Total Width: 72 bits
      Data Width: 64 bits
   Size: 1024 MB
      Form Factor: DIMM
      Set: 2
      Locator: DIMM2_B
      Bank Locator: Not Specified
      Type: DDR2
      Type Detail: Synchronous
      Speed: 667 MHz
      Manufacturer: CE00000000000000
      Serial Number: 231B99EC
      Asset Tag: 010768
      Part Number: M3 91T2953EZ3-CE6

[root@localhost ~]# more /proc/meminfo
MemTotal:    254780 kB
MemFree:       147092 kB
Buffers:       10344 kB
Cached:       55820 kB
SwapCached:       0 kB
Active:       42880 kB
Inactive:       46056 kB
HighTotal:          0 kB
HighFree:          0 kB
LowTotal:    254780 kB
LowFree:       147092 kB
SwapTotal:    4088532 kB
SwapFree:    4088532 kB
Dirty:             0 kB
Writeback:          0 kB
AnonPages:    22836 kB
Mapped:          9432 kB
Slab:          11044 kB
PageTables:    1540 kB
NFS_Unstable:       0 kB
Bounce:             0 kB
CommitLimit: 4215920 kB
Committed_AS: 120948 kB
VmallocTotal: 772088 kB
VmallocUsed:    5752 kB
VmallocChunk: 766164 kB
HugePages_Total:    0
HugePages_Free:    0
HugePages_Rsvd:    0
Hugepagesize:    2048 kB

Tasks:  97 total, 1 running,  96 sleeping, 0 stopped, 0 zombie
Cpu(s):  0.4%us,  0.3%sy,  0.0%ni, 98.4%id,  0.9%wa,  0.0%hi,  0.0%si,  0.0%st
Mem: 254780k total, 107688k used, 147092k free, 10416k buffers
Swap:  4088532k total,       0k used,  4088532k free, 55816k cached

[root@localhost ~]# more /etc/redhat-release
CentOS release 5.7 (Final)

原来安装是5.4，升级到5.7还是不行？

请兄弟们帮忙看下，谢谢！

作者: mihello 时间: 2011-10-22 08:56
free -m 显示多少？

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