问一个很弱的问题，为什么我的 i7 2640M 显示的核心数只有 1 ？

ulovko

回复 10# 方兆国

1. Every x86 and x86_64 CPU has an address translation system that translates virtual addresses into physical addresses.
   
2. 
   
3. The virtual addresses are the ones programs actually use (they are the numerical values of pointer variables in the program).
   
4. 
   
5. The physical addresses are the ones the CPU sends to the memory controller to generate the signals needed to select specific memory locations.
   
6. 
   
7. Each process has its own translation tables, so a pointer in one process with identical value to a pointer in another process doesn't normally point to the same physical memory.
   
8. 
   
9. The older x86 architecture has a translation design that translates a 32 bit virtual address to a 32 bit physical address.
   
10. 
    
11. Newer x86 architecture also supports a translation (called PAE) that translates 32 bit virtual to 36 bit physical.
    
12. 
    
13. The x86_64 architecture has 48 bit virtual addresses. Pointers take 64 bits, but the top 17 bits of any 64 bit pointer are required to be identical (all 17 zeros or all 17 ones) so 16 of those 17 bits are redundant.
    
14. 
    
15. The x86_64 address translation takes in 48 bit virtual addresses on all models. But the number of physical addresses generated varies by model of CPU chip.
    
16. 
    
17. The architecture has an upper limit on the number of physical address bits. I think that is 52, but I'm not sure I remember correctly. But since no one will be using that much physical ram before current CPU models are obsolete, CPU chips don't actually support that much. They support various numbers of physical address bits from 36 up. 40, which you have, is pretty typical.

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http://www.linuxquestions.org/questions/linux-hardware-18/64-bit-cpus-and-the-address-bus-632797/

方兆国

回复 11# ulovko


    额，对了,libvncserver和tigervnc-server哪个好一些

ulovko

回复 12# 方兆国


    不知道 没用过这个东西。。

ulovko

回复 12# 方兆国


    http://blog.csdn.net/binger0823/article/details/7009501

stealfire

方兆国 发表于 2012-05-27 15:24
回复 1# stealfire

  怎么个骗法？这是在联想的官网上买的。

stealfire

ulovko 发表于 2012-05-27 16:47
回复 7# 方兆国

  下边这些就是全部信息了。

不过我的机器禁止了 acpi ，不知道跟这个有关系没。。。

$ cat /proc/cpuinfo
processor        : 0
vendor_id        : GenuineIntel
cpu family        : 6
model                : 42
model name        : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping        : 7
cpu MHz                : 2790.557
cache size        : 4096 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 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc up arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5581.11
clflush size        : 64
cache_alignment        : 64
address sizes        : 36 bits physical, 48 bits virtual
power management:

stealfire

anonymous0502 发表于 2012-05-27 14:18
这是物理机安装的不是虚拟机里的显示？

嗯，物理机。

stealfire

ulovko 发表于 2012-05-27 14:44
http://ark.intel.com/products/53464

嗯。。。我的显示是 1 ……

ulovko

回复 17# stealfire


    真的是物理机， 那您可能真的让黑了。。

stealfire

ulovko 发表于 2012-05-27 21:16
回复 17# stealfire

恢复正常了，现在是4颗。果然是关闭ACPI造成的，我把它开启就ok了。

不太懂ACPI的原理，诡异。

$ cat /proc/cpuinfo
processor        : 0
vendor_id        : GenuineIntel
cpu family        : 6
model                : 42
model name        : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping        : 7
cpu MHz                : 800.000
cache size        : 4096 KB
physical id        : 0
siblings        : 4
core id                : 0
cpu cores        : 2
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 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5581.72
clflush size        : 64
cache_alignment        : 64
address sizes        : 36 bits physical, 48 bits virtual
power management:

processor        : 1
vendor_id        : GenuineIntel
cpu family        : 6
model                : 42
model name        : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping        : 7
cpu MHz                : 800.000
cache size        : 4096 KB
physical id        : 0
siblings        : 4
core id                : 0
cpu cores        : 2
apicid                : 1
initial apicid        : 1
fpu                : yes
fpu_exception        : yes
cpuid level        : 13
wp                : yes
flags                : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5581.21
clflush size        : 64
cache_alignment        : 64
address sizes        : 36 bits physical, 48 bits virtual
power management:

processor        : 2
vendor_id        : GenuineIntel
cpu family        : 6
model                : 42
model name        : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping        : 7
cpu MHz                : 1000.000
cache size        : 4096 KB
physical id        : 0
siblings        : 4
core id                : 1
cpu cores        : 2
apicid                : 2
initial apicid        : 2
fpu                : yes
fpu_exception        : yes
cpuid level        : 13
wp                : yes
flags                : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5581.22
clflush size        : 64
cache_alignment        : 64
address sizes        : 36 bits physical, 48 bits virtual
power management:

processor        : 3
vendor_id        : GenuineIntel
cpu family        : 6
model                : 42
model name        : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping        : 7
cpu MHz                : 800.000
cache size        : 4096 KB
physical id        : 0
siblings        : 4
core id                : 1
cpu cores        : 2
apicid                : 3
initial apicid        : 3
fpu                : yes
fpu_exception        : yes
cpuid level        : 13
wp                : yes
flags                : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5581.22
clflush size        : 64
cache_alignment        : 64
address sizes        : 36 bits physical, 48 bits virtual
power management: