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

[John Naggets <hostingnuggets@xxxxxxxxx>]

Hi George,

You will find the output of "xl dmesg" below. I also managed to
reproduce this problem on another test server. That test server is an
IBM System x3250 M5 server which uses UEFI. So the hardware is not at
fault.

Regards,
John

(XEN) Xen version 4.9.0 (Ubuntu 4.9.0-0ubuntu3)
(stefan.bader@xxxxxxxxxxxxx) (gcc (Ubuntu 7.2.0-8ubuntu2) 7.2.0)
debug=n  Fri Oct 13 15:58:41 UTC 2017
(XEN) Bootloader: GRUB 2.02~beta3-4ubuntu7
(XEN) Command line: placeholder dom0_mem=4G,max:4G dom0_max_vcpus=2
dom0_vcpus_pin no-real-mode edd=off
(XEN) Xen image load base address: 0
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN) Disc information:
(XEN)  Found 0 MBR signatures
(XEN)  Found 0 EDD information structures
(XEN) Multiboot-e820 RAM map:
(XEN)  0000000000000000 - 00000000000a0000 (usable)
(XEN)  00000000000a0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000009e3f8000 (usable)
(XEN)  000000009e3f8000 - 000000009e568000 (ACPI data)
(XEN)  000000009e568000 - 000000009efe1000 (ACPI NVS)
(XEN)  000000009efe1000 - 00000000a0117000 (usable)
(XEN)  00000000a0117000 - 00000000ab6b9000 (reserved)
(XEN)  00000000ab6b9000 - 00000000ab865000 type 20
(XEN)  00000000ab865000 - 00000000af3fc000 (usable)
(XEN)  00000000af3fc000 - 00000000af42e000 (reserved)
(XEN)  00000000af42e000 - 00000000af800000 (usable)
(XEN)  00000000af800000 - 00000000d0000000 (reserved)
(XEN)  00000000fd000000 - 00000000fe800000 (reserved)
(XEN)  00000000fed20000 - 00000000fed45000 (reserved)
(XEN)  00000000ff000000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000840000000 (usable)
(XEN) New Xen image base address: 0xaec00000
(XEN) ACPI Error (tbxfroot-0217): A valid RSDP was not found [20070126]
(XEN) System RAM: 32308MB (33083612kB)
(XEN) Domain heap initialised
(XEN) Found and enabled local APIC!
(XEN) Not enabling x2APIC: depends on iommu_supports_eim.
(XEN) xstate: size: 0xa88 and states: 0x2ff
(XEN) CMCI: threshold 0x2 too large for CPU0 bank 6, using 0x1
(XEN) CMCI: threshold 0x2 too large for CPU0 bank 9, using 0x1
(XEN) CMCI: threshold 0x2 too large for CPU0 bank 10, using 0x1
(XEN) CMCI: threshold 0x2 too large for CPU0 bank 11, using 0x1
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Platform timer is 1.193MHz PIT
(XEN) Detected 2095.087 MHz processor.
(XEN) Initing memory sharing.
(XEN) I/O virtualisation disabled
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) Allocated console ring of 16 KiB.
(XEN) VMX: Supported advanced features:
(XEN)  - APIC MMIO access virtualisation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN)  - Unrestricted Guest
(XEN)  - APIC Register Virtualization
(XEN)  - Virtual Interrupt Delivery
(XEN)  - Posted Interrupt Processing
(XEN)  - VMCS shadowing
(XEN)  - VM Functions
(XEN)  - Virtualisation Exceptions
(XEN)  - Page Modification Logging
(XEN)  - TSC Scaling
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) Brought up 1 CPUs
(XEN) Dom0 has maximum 208 PIRQs
(XEN) ACPI is disabled, notifying Domain 0 (acpi=off)
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x2955000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000820000000->0000000824000000 (1020569
pages to be allocated)
(XEN)  Init. ramdisk: 000000083d299000->000000083fffff40
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff82955000
(XEN)  Init. ramdisk: 0000000000000000->0000000000000000
(XEN)  Phys-Mach map: 0000008000000000->0000008000800000
(XEN)  Start info:    ffffffff82955000->ffffffff829554b4
(XEN)  Page tables:   ffffffff82956000->ffffffff8296f000
(XEN)  Boot stack:    ffffffff8296f000->ffffffff82970000
(XEN)  TOTAL:         ffffffff80000000->ffffffff82c00000
(XEN)  ENTRY ADDRESS: ffffffff824a4180
(XEN) Dom0 has maximum 2 VCPUs
(XEN) Scrubbing Free RAM on 1 nodes using 1 CPUs
(XEN) 
........................................................................................................................................................................................................................................................................done.
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen)
(XEN) Freed 460kB init memory
(XEN) Platform timer appears to have unexpectedly wrapped 1 times.

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
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxxx
>> https://lists.xenproject.org/mailman/listinfo/xen-users

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