bonjour,
Depuis la mise à jour du kernel (4.13.0-36 vers 4.13.0-45) sur mon ubuntu 17.10, le multi-core du processeur a disparu
uname --all
Linux micmormobile 4.13.0-45-generic #50-Ubuntu SMP Wed May 30 08:23:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 158
model name : Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
stepping : 9
microcode : 0x84
cpu MHz : 1600.022
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 : 22
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 pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti retpoline intel_pt rsb_ctxsw spec_ctrl tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips : 4992.00
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
cat /proc/cpuinfo | grep -i "^model name" | awk -F": " '{print $2}' | head -1 | sed 's/ \+/ /g'
Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
cat /proc/cpuinfo | grep -i "^cpu MHz" | awk -F": " '{print $2}' | head -1
2696.146
cat /proc/cpuinfo | grep -i "^processor" | wc -l
1
sudo lshw -C CPU
*********
*-cpu
description: CPU
produit: Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
fabriquant: Intel Corp.
identifiant matériel: 45
information bus: cpu@0
version: Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
numéro de série: To Be Filled By O.E.M.
emplacement: U3E1
taille: 2994MHz
capacité: 4005MHz
bits: 64 bits
horloge: 100MHz
fonctionnalités: 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 pdpe1gb rdtscp constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti retpoline intel_pt rsb_ctxsw spec_ctrl tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp cpufreq
configuration: cores=4 enabledcores=4 threads=4
[code]lscpu
Architecture: x86_64
Mode(s) opératoire(s) des processeurs : 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 1
On-line CPU(s) list: 0
Thread(s) par cœur : 1
Cœur(s) par socket : 1
Socket(s): 1
Nœud(s) NUMA : 1
Identifiant constructeur : GenuineIntel
Famille de processeur : 6
Modèle : 158
Model name: Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
Révision : 9
Vitesse du processeur en MHz : 1600.004
CPU max MHz: 3500,0000
CPU min MHz: 800,0000
BogoMIPS: 4992.00
Virtualisation : VT-x
Cache L1d : 32K
Cache L1i : 32K
Cache L2 : 256K
Cache L3 : 6144K
NUMA node0 CPU(s): 0
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 pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti retpoline intel_pt rsb_ctxsw spec_ctrl tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp
sudo dmidecode --type processor
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 3.0.0 present.
Handle 0x0045, DMI type 4, 48 bytes
Processor Information
Socket Designation: U3E1
Type: Central Processor
Family: Core i5
Manufacturer: Intel(R) Corporation
ID: E9 06 09 00 FF FB EB BF
Signature: Type 0, Family 6, Model 158, Stepping 9
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
PAE (Physical address extension)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
PSE-36 (36-bit page size extension)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (FXSAVE and FXSTOR instructions supported)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Multi-threading)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
Voltage: 0.8 V
External Clock: 100 MHz
Max Speed: 8300 MHz
Current Speed: 2400 MHz
Status: Populated, Enabled
Upgrade: Other
L1 Cache Handle: 0x0042
L2 Cache Handle: 0x0043
L3 Cache Handle: 0x0044
Serial Number: To Be Filled By O.E.M.
Asset Tag: To Be Filled By O.E.M.
Part Number: To Be Filled By O.E.M.
Core Count: 4
Core Enabled: 4
Thread Count: 4
Characteristics:
64-bit capable
Multi-Core
Execute Protection
Enhanced Virtualization
Power/Performance Control
[/code]
Pourtant dans dmidecode --type processor indique bien 4 cores
Commandes passées au kernel lors du boot: acpi_osi=Linux pci=nomsi nouveau.modeset=0 intel_iommu=on reboot=acpi reboot=pci quiet splash
Étonnant cette perte du multi-core lors de cet upgrade de kernel.
