Por que minhas CPUs não são numeradas sequencialmente?

Question

Estou usando o Arch Linux

Linux JamesPC 4.10.11-1-ARCH #1 SMP PREEMPT Tue Apr 18 08:39:42 CEST 2017 x86_64 GNU/Linux

Ao tentar descobrir por que meu monitor do sistema está mostrando apenas uma CPU (quando eu deveria ter seis):

Descobri essa estranheza que acho que pode estar fazendo com que o monitor do sistema não funcione corretamente:

cat / proc / cpuinfo:

[gilmoreja@JamesPC ~]$ cat /proc/cpuinfo
processor   : 0
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 0
cpu cores   : 3
apicid      : 16
initial apicid  : 0
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6624.13
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

processor   : 3
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 1
cpu cores   : 3
apicid      : 17
initial apicid  : 1
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6623.14
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

processor   : 4
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 2
cpu cores   : 3
apicid      : 18
initial apicid  : 2
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6623.22
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

processor   : 5
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 3
cpu cores   : 3
apicid      : 19
initial apicid  : 3
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6623.22
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

processor   : 6
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 4
cpu cores   : 3
apicid      : 20
initial apicid  : 4
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6623.23
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

processor   : 7
vendor_id   : AuthenticAMD
cpu family  : 21
model       : 1
model name  : AMD FX(tm)-6100 Six-Core Processor
stepping    : 2
microcode   : 0x600063d
cpu MHz     : 3311.103
cache size  : 2048 KB
physical id : 0
siblings    : 6
core id     : 5
cpu cores   : 3
apicid      : 21
initial apicid  : 5
fpu     : yes
fpu_exception   : yes
cpuid level : 13
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
bugs        : fxsave_leak sysret_ss_attrs null_seg
bogomips    : 6623.22
TLB size    : 1536 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb

lscpu:

[gilmoreja@JamesPC ~]$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                6
On-line CPU(s) list:   0,3-7
Thread(s) per core:    2
Core(s) per socket:    3
Socket(s):             1
NUMA node(s):          1
Vendor ID:             AuthenticAMD
CPU family:            21
Model:                 1
Model name:            AMD FX(tm)-6100 Six-Core Processor
Stepping:              2
CPU MHz:               3311.103
BogoMIPS:              6624.13
Virtualization:        AMD-V
L1d cache:             16K
L1i cache:             64K
L2 cache:              2048K
L3 cache:              8192K
NUMA node0 CPU(s):     0,3-7
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold

Minhas CPUs não são listadas sequencialmente e, em vez disso, são numeradas como 0, 3, 4, 5, 6 e 7.

Por que minhas CPUs não são numeradas sequencialmente? Como posso consertar isso para que eles sejam?

    

Answer 1

O kernel do Linux atribui um número de CPU para cada CPU listada na tabela APIC da máquina (veja comandos para despejar a tabela da CPU ). A tabela contém um bit "ativado" para cada núcleo. O FX-6100 é realmente fabricado como um processador de 8 núcleos, mas 2 núcleos são desativados pela AMD. 2.html "> Tomshardware diz " Todos os sete processadores FX baseados no Zambeze empregam o mesmo silício. Alguns dos processadores têm um módulo Bulldozer desactivado, e alguns têm dois desligados. " Isso provavelmente é feito quando um núcleo falha no QA - o processador de 8 núcleos pode ter alguns núcleos desativados e ainda ser vendido como uma parte de especificação inferior.

Dois núcleos sendo desativados corresponderiam à sua descrição que os núcleos "0, 3, 4, 5, 6 e 7" são funcionais - os núcleos 1 e 2 estariam presentes, mas desativados na tabela APIC. Eu não tenho um FX-6100 para despejar a mesa e verificar isso com certeza, mas parece uma explicação provável.