[Xen-users] transfer (v)CPU from Dom0 to DomU

[Yannick Barbeaux <ybarbeaux@xxxxxxxxx>]

Hello,

As the title says, I am willing to transfer one CPU Core from my dom0 to one of my virtual machine.

I have not found any easy "how-to" explaining clearly the step-by-step procedure.

Here are the details of the CPU distribution:

dom0:/# xm vcpu-list 

Name                                ID  VCPU   CPU State   Time(s) CPU Affinity

Domain-0                             0     0     0   r--   12503.2 any cpu

Domain-0                             0     1     1   -b-    1136.3 any cpu

Domain-0                             0     2     -   --p       7.2 any cpu

Domain-0                             0     3     -   --p       1.3 any cpu

srv1.mydom.be                    1     0     2   -b-   24588.0 2

srv2.mydom.be                    9     0     3   -b-    8727.8 0,3

srv1 is hosting a mail server (postfix,cyrus) and running fine

srv2 is hosting a website (apache) and is sometimes very (too) busy. I added 1GB of memory in the xen config file and that helped but the limit is now the CPU load.

As dom0 (running debian 5.0.10) does not host many services, I think that only one core would be enough (CPU is 99% idle most of the time).

I am definitely not an expert using Xen so could someone explain me how to transfer CPU assignation?

Should I use VCPUs or only CPUs?

Here are the cpuinfo for all my domains: 

the actual situation is : dom0 has 2 processors while srv1 and srv2 have only one:

dom0:/# cat /proc/cpuinfo

processor : 0

vendor_id : GenuineIntel

cpu family : 6

model : 15

model name : Intel(R) Xeon(R) CPU           X3220  @ 2.40GHz

stepping : 11

cpu MHz : 2400.166

cache size : 4096 KB

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 10

wp : yes

flags : fpu de tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht nx constant_tsc pni ssse3

bogomips : 4802.91

clflush size : 64

power management:

processor : 1

vendor_id : GenuineIntel

cpu family : 6

model : 15

model name : Intel(R) Xeon(R) CPU           X3220  @ 2.40GHz

stepping : 11

cpu MHz : 2400.166

cache size : 4096 KB

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 10

wp : yes

flags : fpu de tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht nx constant_tsc pni ssse3

bogomips : 4802.91

clflush size : 64

power management:

srv1:~# cat /proc/cpuinfo

processor : 0

vendor_id : GenuineIntel

cpu family : 6

model : 15

model name : Intel(R) Xeon(R) CPU           X3220  @ 2.40GHz

stepping : 11

cpu MHz : 2400.084

cache size : 4096 KB

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 10

wp : yes

flags : fpu de tsc msr pae cx8 apic cmov pat clflush acpi mmx fxsr sse sse2 ss ht nx constant_tsc up pni ssse3

bogomips : 4806.37

clflush size : 64

power management:

srv2:/# cat /proc/cpuinfo

processor : 0

vendor_id : GenuineIntel

cpu family : 6

model : 15

model name : Intel(R) Xeon(R) CPU           X3220  @ 2.40GHz

stepping : 11

cpu MHz : 2400.082

cache size : 4096 KB

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 10

wp : yes

flags : fpu de tsc msr pae cx8 apic cmov pat clflush acpi mmx fxsr sse sse2 ss ht nx constant_tsc up pni ssse3

bogomips : 4803.14

clflush size : 64

power management:

Thank you for your help,

Yannick

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