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Ubuntu 服务器 11.04 仅识别 1 个核心，而不是 4 个

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Ubuntu 服务器 11.04 仅识别 1 个核心，而不是 4 个

我搜索了其他问题，并在 Google 上搜索了很多次，但没有找到解决此问题的方法。
我已经Ubuntu Server 11.04 64bit在我的 上安装Dell Poweredge了Intel Xeon X5450。

服务器仅识别我拥有的 4 个核心中的 1 个。我尝试修改GRUB配置，但没有成功。在机器中BIOS我没有找到任何有用的东西。

中央处理器

root@darwin:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 23
model name      : Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz
stepping        : 10
cpu MHz         : 2992.180
cache size      : 6144 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips        : 5984.36
clflush size    : 64
cache_alignment : 64
address sizes   : 38 bits physical, 48 bits virtual
power management:

GRUB

root@darwin:~# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=2
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="noapic nolapic" #was with acpi=off

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

完成 dmesg

太长了，发布在 pastebin 上http://pastebin.com/bsKPBhzu

lshw-类 cpu

 *-cpu:0
       description: CPU
       product: Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz
       vendor: Intel Corp.
       physical id: 400
       bus info: cpu@0
       version: Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz
       slot: CPU1
       size: 3GHz
       capacity: 3600MHz
       width: 64 bits
       clock: 1333MHz
       capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 xsave lahf_lm tpr_shadow vnmi flexpriority
       configuration: cores=4 enabledcores=4 threads=4
  *-cpu:1 DISABLED
       description: CPU [empty]
       vendor: Intel
       physical id: 401
       slot: CPU2
       capabilities: x86-64

搞不懂。最后这条命令显示核心为 4 个，且全部启用。按 1 后的
命令top仅显示CPU0。

答案1

您的 dmesg 包含以下日志消息：

[    0.016051] SMP disabled

通过查看内核源代码，似乎nolapic内核参数阻止了内核以 SMP 模式启动。如果删除此参数，则所有 CPU 都可用。

noapic和参数有什么用处吗nolapic？如果没有，那就没问题了。

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