Re: [Xen-users] Only one CPU available to Xen? (nr_cpus : 1)

[John Naggets <hostingnuggets@xxxxxxxxx>]

Hi George,

Sure, I will post you the output of "xl dmesg" tomorrow as I am not in
the office any more.

In the meantime I am thinking that it must be the combination UEFI ->
GRUB -> Xen which creates this issue so I added the Xen EFI directly
in the UEFI boot of that server by following the Xen wiki
documentation 
(https://wiki.xenproject.org/wiki/Xen_EFI#Xen_as_EFI_binary_.28loading.29).
But until now I did not manage to make it boot using UEFI -> Xen. I
get the following error message right when starting to load the Xen
4.9.0 EFI loader:

Read failed for initrd.img-4.13.0-36-generic: ErrCode: 0x8000000000000004

Regards,
John




On Mon, Mar 5, 2018 at 4:21 PM, George Dunlap <dunlapg@xxxxxxxxx> wrote:
> On Sat, Mar 3, 2018 at 11:19 AM, John Naggets <hostingnuggets@xxxxxxxxx> 
> wrote:
>> Hello,
>>
>> I am running Xen 4.9.0 on Ubuntu 17.10 on a new Lenovo ThinkSystem
>> SR630 server and have noticed that Xen reports only one CPU available.
>> Is this normal? or is something wrong in my setup?
>
> No, that's distinctly not normal. Assuming your ThinkSystem server has
> more than one logical cpu of course. :-)
>
> Would you mind attaching the output of `xl dmesg` as well?
>
> Thanks,
>  -George
>
>>
>> Here is the output of "xl info":
>>
>> release                : 4.13.0-32-generic
>> version                : #35-Ubuntu SMP Thu Jan 25 09:13:46 UTC 2018
>> machine                : x86_64
>> nr_cpus                : 1
>> max_cpu_id             : 0
>> nr_nodes               : 1
>> cores_per_socket       : 1
>> threads_per_core       : 1
>> cpu_mhz                : 2095
>> hw_caps                :
>> bfebfbff:77fef3f7:2c100800:00000121:0000000f:d19ffffb:00000008:00000100
>> virt_caps              : hvm
>> total_memory           : 32308
>> free_memory            : 15534
>> sharing_freed_memory   : 0
>> sharing_used_memory    : 0
>> outstanding_claims     : 0
>> free_cpus              : 0
>> xen_major              : 4
>> xen_minor              : 9
>> xen_extra              : .0
>> xen_version            : 4.9.0
>> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
>> hvm-3.0-x86_32p hvm-3.0-x86_64
>> xen_scheduler          : credit
>> xen_pagesize           : 4096
>> platform_params        : virt_start=0xffff800000000000
>> xen_changeset          :
>> xen_commandline        : placeholder dom0_mem=4G,max:4G
>> dom0_max_vcpus=2 dom0_vcpus_pin no-real-mode edd=off
>> cc_compiler            : gcc (Ubuntu 7.2.0-8ubuntu2) 7.2.0
>> cc_compile_by          : stefan.bader
>> cc_compile_domain      : canonical.com
>> cc_compile_date        : Fri Oct 13 15:58:41 UTC 2017
>> build_id               : 889e50dffcb9ab064c376b1278be0a259e95dd43
>> xend_config_format     : 4
>>
>> See under nr_cpus only "1" is available. Also have a look at the
>> output of "xl vcpu-list" where I have VM1 with 4 vCPUs and VM2 with 1
>> vCPU:
>>
>> Name                                ID  VCPU   CPU State   Time(s)
>> Affinity (Hard / Soft)
>> Domain-0                             0     0    0   r--  125665.8  all / all
>> Domain-0                             0     1    -   --p       0.0  all / all
>> vm2.somefancydomaintest.co          10     0    0   -b-   17377.2  all / all
>> vm1.somefancydomaintest.co          11     0    0   -b-     617.9  all / all
>> vm1.somefancydomaintest.co          11     1    0   -b-     630.7  all / all
>> vm1.somefancydomaintest.co          11     2    0   -b-    1065.0  all / all
>> vm1.somefancydomaintest.co          11     3    0   -b-     590.2  all / all
>>
>> Finally here is the output of "lscpu":
>>
>> Architecture:        x86_64
>> CPU op-mode(s):      32-bit, 64-bit
>> Byte Order:          Little Endian
>> CPU(s):              1
>> On-line CPU(s) list: 0
>> Thread(s) per core:  1
>> Core(s) per socket:  1
>> Socket(s):           1
>> NUMA node(s):        1
>> Vendor ID:           GenuineIntel
>> CPU family:          6
>> Model:               85
>> Model name:          Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
>> Stepping:            4
>> CPU MHz:             2095.140
>> BogoMIPS:            4190.17
>> Hypervisor vendor:   Xen
>> Virtualization type: none
>> L1d cache:           32K
>> L1i cache:           32K
>> L2 cache:            1024K
>> L3 cache:            11264K
>> NUMA node0 CPU(s):   0
>> Flags:               fpu de tsc msr pae mce cx8 apic sep mca cmov pat
>> clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc
>> rep_good nopl nonstop_tsc cpuid pni pclmulqdq est ssse3 fma cx16
>> sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor
>> lahf_lm abm 3dnowprefetch intel_ppin fsgsbase bmi1 hle avx2 bmi2 erms
>> rtm avx512f avx512dq rdseed adx clflushopt clwb avx512cd avx512bw
>> avx512vl xsaveopt xsavec xgetbv1
>>
>> Here I should be seeing 2 CPUs as I am using the "dom0_max_vcpus=2
>> kernel parameter but the output only shows 1.
>>
>> Any ideas what could be wrong in my setup? or is this normal? I have
>> the feeling my whole dom0 and domUs are running on a single core...
>>
>> Best regards,
>> John
>>
>> _______________________________________________
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>> Xen-users@xxxxxxxxxxxxxxxxxxxx
>> https://lists.xenproject.org/mailman/listinfo/xen-users

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