[Bugme-new] [Bug 11261] New: cpu number error after disable some LCPU by CPU HOTPLUG
bugme-daemon at bugzilla.kernel.org
bugme-daemon at bugzilla.kernel.org
Thu Aug 7 01:33:47 PDT 2008
http://bugzilla.kernel.org/show_bug.cgi?id=11261
Summary: cpu number error after disable some LCPU by CPU HOTPLUG
Product: Platform Specific/Hardware
Version: 2.5
KernelVersion: 2.6.27-rc2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: x86-64
AssignedTo: platform_x86_64 at kernel-bugs.osdl.org
ReportedBy: alex.shi at intel.com
Latest working kernel version:unknown
Earliest failing kernel version:
Distribution:Fedora 8
Hardware Environment:Intel harpertown & hahelem
Software Environment:
Problem Description:
only 2 cpus found after disable some LCPUS by CPU HOTPLUG feature.
[alexs at lkp-st01-x8664 ~]$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Genuine Intel(R) CPU @ 2.66GHz
stepping : 11
cpu MHz : 2660.005
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic 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 pni monitor ds_cpl vmx est tm2
ssse3 cx16 xtpr dca lahf_lm
bogomips : 5320.01
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Genuine Intel(R) CPU @ 2.66GHz
stepping : 11
cpu MHz : 2660.005
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic 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 pni monitor ds_cpl vmx est tm2
ssse3 cx16 xtpr dca lahf_lm
bogomips : 5320.13
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
[alexs at lkp-st01-x8664 ~]$ cat /proc/interrupts
CPU0 CPU2 CPU4 CPU5 CPU6 CPU7
0: 29 0 0 0 0 0
IO-APIC-edge timer
1: 1 0 0 0 0 1
IO-APIC-edge i8042
3: 0 1 0 0 1 0
IO-APIC-edge
4: 44 35 48 47 28 46
IO-APIC-edge serial
9: 0 0 0 0 0 0
IO-APIC-fasteoi acpi
12: 0 1 1 0 1 0
IO-APIC-edge i8042
14: 26 24 34 14 32 15
IO-APIC-edge ide0
17: 8 6 6 8 6 7
IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2
18: 0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb4
19: 34171 32765 13804 699 12332 697
IO-APIC-fasteoi ahci, uhci_hcd:usb3
28: 11 16 9 8 89642 14
IO-APIC-fasteoi eth2
198: 1282 47633 1641 1640 9 1656
PCI-MSI-edge eth3
NMI: 0 0 0 0 0 0
Non-maskable interrupts
LOC: 13165275 13165482 13165424 12586776 13165261 12588924 Local
timer interrupts
RES: 215710 209353 214538 214149 209574 210073
Rescheduling interrupts
CAL: 209 225 227 222 224 52
function call interrupts
TLB: 3904740 3799777 3908838 3887585 3828639 3853560 TLB
shootdowns
TRM: 0 0 0 0 0 0
Thermal event interrupts
THR: 0 0 0 0 0 0
Threshold APIC interrupts
SPU: 0 0 0 0 0 0
Spurious interrupts
ERR: 0
[alexs at lkp-st01-x8664 ~]$ cat /sys/devices/system/cpu/online
0,2,4-7
Steps to reproduce:
1, echo 0 > /sys/devices/system/cpu/cpuX/online
2, cat /proc/cpuinfo
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