VMware ESXi 4.1.0 Update 1 : CPU Hot plug

I referred to the following URL.
http://communities.vmware.com/docs/DOC-10493

[ software info ]

ESXi

~ # vmware -l VMware ESXi 4.1.0 Update 1

VM is Scientific Linux6 (SL6) 32bit. I assigned 1 vCPU.

[root@sl6-1 ~]# cat /etc/redhat-release Scientific Linux release 6.0 (Carbon) [root@sl6-1 ~]# uname -r 2.6.32-131.6.1.el6.i686

[ procedures ]

Step1

power off VM

Step2

on vSphere client , enable CPU hot plug to that VM.

Step3

power on VM

Step4

add vCPUs

on vSphere client , VM -> edit -> Hardware -> CPU
I changed # of vCPUs from 1 to 4.


dmesg

[root@sl6-1 ~]# dmesg processor LNXCPU:03: registered as cooling_device3 SMP alternatives: switching to SMP code Booting Node 0 Processor 3 APIC 0x3 Initializing CPU#3 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 3, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable. Booting Node 0 Processor 2 APIC 0x2 Initializing CPU#2 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 2, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable. Booting Node 0 Processor 1 APIC 0x1 Initializing CPU#1 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 1, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable.

# of vCPU truns 4.

[root@sl6-1 ~]# cat /proc/cpuinfo | grep "model name" | wc -l 4

On SL6 32bit , I don’t need to do anything to activate hot-plugged vCPUs.
Just only change # of vCPUs via vSphere client.

change # of vCPUs from 4 to 8.

# of vCPU turns 8.

[root@sl6-1 ~]# cat /proc/cpuinfo | grep "model name" | wc -l 8

dmesg

processor LNXCPU:07: registered as cooling_device7 Booting Node 0 Processor 6 APIC 0x6 Initializing CPU#6 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 6, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable. Booting Node 0 Processor 5 APIC 0x5 Initializing CPU#5 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 5, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable. Booting Node 0 Processor 4 APIC 0x4 Initializing CPU#4 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 4, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable. Booting Node 0 Processor 7 APIC 0x7 Initializing CPU#7 mce: CPU supports 0 MCE banks x86 PAT enabled: cpu 7, old 0x0, new 0x7010600070106 Skipped synchronization checks as TSC is reliable.

[root@sl6-1 cpu]# pwd /sys/devices/system/cpu [root@sl6-1 cpu]# ls cpu0  cpu2  cpu4  cpu6  cpufreq  kernel_max  online    present cpu1  cpu3  cpu5  cpu7  cpuidle  offline     possible [root@sl6-1 cpu]# [root@sl6-1 cpu]# cat online 0-7