Hi ,

We got a Dell Power Edge 1850 system with Red Hat Enterprise Linux ES release 4 (Nahant Update 3). Kernel 2.6.9-34.0.1.ELsmp .

The o/p of dmidecode shows 2 Processors present on the system :

Handle 0x0400
DMI type 4, 40 bytes.
Processor Information
Socket Designation: PROC_1
Type: Central Processor
Family: Xeon
Manufacturer: Intel
ID: 48 0F 00 00 FF FB EB BF
Signature: Type 0, Family F, Model 4, Stepping 8
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 (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Hyper-threading technology)
TM (Thermal monitor supported)
SBF (Signal break on FERR)
Version: Not Specified
Voltage: 1.4 V
Voltage: 1.4 V
External Clock: 800 MHz
Max Speed: 3600 MHz
Current Speed: 2800 MHz
Status: Populated, Enabled
Upgrade: ZIF Socket
L1 Cache Handle: 0x0700
L2 Cache Handle: 0x0701
L3 Cache Handle: 0x0702
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified


Handle 0x0401
DMI type 4, 40 bytes.
Processor Information
Socket Designation: PROC_2
Type: Central Processor
Family: Xeon
Manufacturer: Intel
ID: 48 0F 00 00 FF FB EB BF
Signature: Type 0, Family F, Model 4, Stepping 8
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 (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Hyper-threading technology)
TM (Thermal monitor supported)
SBF (Signal break on FERR)
Version: Not Specified
Voltage: 1.4 V
External Clock: 800 MHz
Max Speed: 3600 MHz
Current Speed: 2800 MHz
Status: Populated, Idle
Upgrade: ZIF Socket
L1 Cache Handle: 0x0703
L2 Cache Handle: 0x0704
L3 Cache Handle: 0x0705
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified




Whereas the o/p of cat /proc/cpuinfo shows 8 CPU's .....


[root@tru-dp-websvc2 ~]# cat /proc/cpuinfo | grep processor
processor : 0
processor : 1
processor : 2
processor : 3
processor : 4
processor : 5
processor : 6
processor : 7

Now can someone exlpain me why is it so ?
Thanx in advance.

Hi ,

We got a Dell Power Edge 1850 system with Red Hat Enterprise Linux ES release 4 (Nahant Update 3). Kernel 2.6.9-34.0.1.ELsmp .

The o/p of dmidecode shows 2 Processors present on the system :

Handle 0x0400
DMI type 4, 40 bytes.
Processor Information
Socket Designation: PROC_1
Type: Central Processor
Family: Xeon
Manufacturer: Intel
ID: 48 0F 00 00 FF FB EB BF
Signature: Type 0, Family F, Model 4, Stepping 8
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 (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Hyper-threading technology)
TM (Thermal monitor supported)
SBF (Signal break on FERR)
Version: Not Specified
Voltage: 1.4 V
Voltage: 1.4 V
External Clock: 800 MHz
Max Speed: 3600 MHz
Current Speed: 2800 MHz
Status: Populated, Enabled
Upgrade: ZIF Socket
L1 Cache Handle: 0x0700
L2 Cache Handle: 0x0701
L3 Cache Handle: 0x0702
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified


Handle 0x0401
DMI type 4, 40 bytes.
Processor Information
Socket Designation: PROC_2
Type: Central Processor
Family: Xeon
Manufacturer: Intel
ID: 48 0F 00 00 FF FB EB BF
Signature: Type 0, Family F, Model 4, Stepping 8
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 (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Hyper-threading technology)
TM (Thermal monitor supported)
SBF (Signal break on FERR)
Version: Not Specified
Voltage: 1.4 V
External Clock: 800 MHz
Max Speed: 3600 MHz
Current Speed: 2800 MHz
Status: Populated, Idle
Upgrade: ZIF Socket
L1 Cache Handle: 0x0703
L2 Cache Handle: 0x0704
L3 Cache Handle: 0x0705
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified




Whereas the o/p of cat /proc/cpuinfo shows 8 CPU's .....


[root@tru-dp-websvc2 ~]# cat /proc/cpuinfo | grep processor
processor : 0
processor : 1
processor : 2
processor : 3
processor : 4
processor : 5
processor : 6
processor : 7

Now can someone exlpain me why is it so ?
Thanx in advance.

One more addition to above.

The o/p of TOP command shows something else...only single CPU :


top - 03:08:15 up 161 days, 17:11, 1 user, load average: 0.05, 0.03, 0.00
Tasks: 126 total, 1 running, 124 sleeping, 0 stopped, 1 zombie
Cpu(s): 0.5% us, 0.1% sy, 0.0% ni, 99.3% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 4147196k total, 2606772k used, 1540424k free, 404992k buffers
Swap: 0k total, 0k used, 0k free, 1555668k cached

One more addition to above.

The o/p of TOP command shows something else...only single CPU :


top - 03:08:15 up 161 days, 17:11, 1 user, load average: 0.05, 0.03, 0.00
Tasks: 126 total, 1 running, 124 sleeping, 0 stopped, 1 zombie
Cpu(s): 0.5% us, 0.1% sy, 0.0% ni, 99.3% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 4147196k total, 2606772k used, 1540424k free, 404992k buffers
Swap: 0k total, 0k used, 0k free, 1555668k cached

Looking at the specs I'd say dmidecode is telling you you have two slots on the m/board.
Each of which is dual core and hiper-threaded.

So 2 becomes 8.

As for top, read the manpage - it'll show all 8 if requested.

Great !! A tiny but perfect reply.
Thanks a ton.

Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. I have merged your two threads together into one.