potatochip
July 16th, 2012, 03:12 PM
I have a 12.04 system with a quad core CPU.
I noticed today though only one CPU is now being used.
Nothing has changed on the box except an apt-get upgrade and it has been happily running it's 4 cores for 4 or 5 years.
I'm out of the country so I haven't been fiddling with the BIOS and unfortunately can't check any of the BIOS settings either.
Has anyone else had this happen?
Here's the output of cat /proc/cpuinfo showing just the one entry rather than the usual four. htop and top also show just the single core.
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 5
model name : AMD Athlon(tm) II X4 620 Processor
stepping : 2
microcode : 0x1000086
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 5
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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save
bogomips : 5224.07
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
Here's my uname -a
Linux twistie 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
in case it's useful.
I noticed today though only one CPU is now being used.
Nothing has changed on the box except an apt-get upgrade and it has been happily running it's 4 cores for 4 or 5 years.
I'm out of the country so I haven't been fiddling with the BIOS and unfortunately can't check any of the BIOS settings either.
Has anyone else had this happen?
Here's the output of cat /proc/cpuinfo showing just the one entry rather than the usual four. htop and top also show just the single core.
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 5
model name : AMD Athlon(tm) II X4 620 Processor
stepping : 2
microcode : 0x1000086
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 5
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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save
bogomips : 5224.07
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
Here's my uname -a
Linux twistie 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
in case it's useful.