i5-2500 only using 3 cores instead of 4?

[boggie1688]

Hi!

I just upgraded my freenas build's motherboard and cpu from an AMD Phenom 3 core to a Intel i5-2500K 4 core. Booted up fine, but I noticed in the reporting section of the system, it only lists:
Cpu0
Cpu1
Cpu2

Cpu3 is missing.
Freenas correctly detects that I now have a Intel i5 2500 4 core, but it appears to not be using the 4th core.

I ran:
dmesg | grep -i cpu

I received the following output:

Code:

CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (3309.79-MHz K8-class CPU)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
SMP: AP CPU #2 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3
CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (3309.79-MHz K8-class CPU)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3
CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (3309.79-MHz K8-class CPU)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3

I don't claim to completely understand everything there, but I imagine I should also be seeing "SMP: AP CPU #4 Launched!".

Anyone know how I might go about getting Freenas to use the 4th core?

 

[anmnz]

Those log entries are normal for a 4-core system. The system initially starts up using 1 CPU core, and then the "SMP: AP CPU launched" messages are telling you that it has found the others. You can then see all 4 CPU cores in the later messages. They are named "cpu0", "cpu1", "cpu2", "cpu3".

 

[boggie1688]

Those log entries are normal for a 4-core system. The system initially starts up using 1 CPU core, and then the "SMP: AP CPU launched" messages are telling you that it has found the others. You can then see all 4 CPU cores in the later messages. They are named "cpu0", "cpu1", "cpu2", "cpu3".

Ahh ok, thank you for explaining that!

 

[boggie1688]

Those log entries are normal for a 4-core system. The system initially starts up using 1 CPU core, and then the "SMP: AP CPU launched" messages are telling you that it has found the others. You can then see all 4 CPU cores in the later messages. They are named "cpu0", "cpu1", "cpu2", "cpu3".

Wait hold on, under reporting I can only see temps for cpu0, cpu1 and cpu2. Should I see a cpu3 too?

 

[anmnz]

I would imagine so but without seeing anything it's hard to know. As this seems to be a reporting problem, rather than an OS functionality problem, can I suggest you start a new thread and provide screenshots?

 

[boggie1688]

I would imagine so but without seeing anything it's hard to know. As this seems to be a reporting problem, rather than an OS functionality problem, can I suggest you start a new thread and provide screenshots?

I've created a new thread as suggested. You can find it here, screenshots included : https://www.ixsystems.com/community/threads/i5-2500-4core-only-reporting-as-3-cores.80774/