Re: [Xen-users] xen only shows only ONE "cpu core"

[Israel Garcia <igalvarez@xxxxxxxxx>]

On 12/18/09, Steven Timm <timm@xxxxxxxx> wrote:
> I see the same behavior between Xen kernel showing cpu_cores=1
> and non-xen kernel showing cpu_cores=4 on the dom0 of a very
> similar machine.   Xen, and anything else, can still access
> all the cores, it just reports them differently in /proc/cpuinfo
> so that it makes it more difficult to detect a multi-core cpu
> by parsing its output.
Hi Steven
It's possible what you're saying but we use to monitor CPU and only
cpu-0 shows stats.. thee other 3 cpu-1,2,3 have never showed any
stats. I think there's something wrong here..

regards,
Israe.

>
> Steve Timm
>
>
>
> On Fri, 18 Dec 2009, Israel Garcia wrote:
>
>> On 12/18/09, Steven Timm <timm@xxxxxxxx> wrote:
>>>
>>> Is this on the dom0 or domU.
>> Hi, it's on a dom0.
>> processor is:
>> Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
>>
>>>
>>> If on the domU, what value of vcpus do you have
>>> in the config file.
>>>
>>> For what it's worth on my dom0 Xeon E5430 CPU running
>>> xen kernel it shows 8 processor entries in /proc/cpuinfo
>>> and shows each one of them with cpu cores : 1 too.
>> I have another server (not a xen kernel) which show 4 "cpu core". see
>> below:
>>
>> processor       : 0
>> vendor_id       : GenuineIntel
>> cpu family      : 6
>> model           : 23
>> model name      : Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
>> stepping        : 6
>> cpu MHz         : 2500.086
>> cache size      : 6144 KB
>> physical id     : 0
>> siblings        : 4
>> core id         : 0
>> cpu cores       : 4   <--- LOOK HERE
>> 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 s
>> s 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 sse4_
>> 1 lahf_lm
>> bogomips        : 5003.91
>> clflush size    : 64
>> cache_alignment : 64
>> address sizes   : 38 bits physical, 48 bits virtual
>> power management:
>>
>> But this server runs a NON xen kernel. Both CPU's are quadcore.
>> That's why I'm  curious :)
>> Why with a normal kernel sees 4 cores and witn a xen kernel only one?
>> Same OS, almost same CPU (E5410-XEN_dom0 and E5420-NOT_XEN_SERVER)??
>>
>> regards,
>> Israel.
>>
>>>
>>> Steve Timm
>>>
>>>
>>> On Fri, 18 Dec 2009, Israel Garcia wrote:
>>>
>>>> Hi,
>>>> Do you know why xen kernel shows me only one "cpu cores" when there are
>>>> 4?
>>>>
>>>> see part of cat /proc/cpuinfo
>>>>
>>>> processor       : 0
>>>> vendor_id       : GenuineIntel
>>>> cpu family      : 6
>>>> model           : 23
>>>> model name      : Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
>>>> stepping        : 10
>>>> cpu MHz         : 2333.430
>>>> cache size      : 6144 KB
>>>> physical id     : 0
>>>> siblings        : 1
>>>> core id         : 0
>>>> cpu cores       : 1    <---only ONE
>>>> apicid          : 0
>>>> initial apicid  : 0
>>>> fpu             : yes
>>>> fpu_exception   : yes
>>>> cpuid level     : 13
>>>> wp              : yes
>>>> flags           : fpu de tsc msr pae cx8 apic sep mtrr cmov pat
>>>> clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_ts
>>>> c rep_good pni ssse3 cx16 sse4_1 lahf_lm
>>>> bogomips        : 4674.06
>>>> clflush size    : 64
>>>> cache_alignment : 64
>>>> address sizes   : 38 bits physical, 48 bits virtual
>>>> power management:
>>>>
>>>> I'm running XEN on debian lenny:
>>>> grub-info:
>>>> title           Xen 3.2-1-amd64 / Debian GNU/Linux, kernel
>>>> 2.6.26-1-xen-amd64
>>>> root            (hd0,0)
>>>> kernel          /xen-3.2-1-amd64.gz
>>>> module          /vmlinuz-2.6.26-1-xen-amd64 root=/dev/mapper/vg0-root
>>>> ro console=tty0
>>>> module          /initrd.img-2.6.26-1-xen-amd64
>>>>
>>>> uname -r:
>>>> 2.6.26-1-xen-amd64
>>>>
>>>> regards,
>>>> Israel.
>>>>
>>>> _______________________________________________
>>>> Xen-users mailing list
>>>> Xen-users@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-users
>>>>
>>>
>>> --
>>> ------------------------------------------------------------------
>>> Steven C. Timm, Ph.D  (630) 840-8525
>>> timm@xxxxxxxx  http://home.fnal.gov/~timm/
>>> Fermilab Computing Division, Scientific Computing Facilities,
>>> Grid Facilities Department, FermiGrid Services Group, Assistant Group
>>> Leader.
>>>
>>
>>
>>
>
> --
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525
> timm@xxxxxxxx  http://home.fnal.gov/~timm/
> Fermilab Computing Division, Scientific Computing Facilities,
> Grid Facilities Department, FermiGrid Services Group, Assistant Group
> Leader.
>


-- 
Regards;
Israel Garcia

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