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    XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching

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    • S Offline
      sapcode
      last edited by

      Dear XCP team,

      we have a server from Supermicro CSE-829U X10DRU-i+ with double socket: 2 x Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz, Speed: 2299 MHz CPU.

      xl info:
      nr_cpus : 80
      max_cpu_id : 79
      nr_nodes : 2
      cores_per_socket : 20
      threads_per_core : 2

      However if we assign all 80 CPU's to a VM SLES or Ubuntu Server when we fire lscpu it always shows 64 and only 1 NUMA node.

      When we set the VCPUs-max = 80 and cores-per-socket: 40 using xe command the VM boots but still shows 64 CPU and only 1 numa node.

      xe template-param-set uuid=xxx VCPUs-max=80
      xe vm-param-set uuid=xxx VCPUs-max=80

      We have also tried Exporting the defualt linux VM template and changed the inner restriction from 32 to 80.

      Before:
      <restriction field="vcpus-max" max="32"/><restriction field="has-vendor-device" value="false"/><restriction field="supports-bios" value="yes"/>

      After:
      <restriction field="vcpus-max" max="80"/><restriction field="has-vendor-device" value="false"/><restriction field="supports-bios" value="yes"/>

      Afterwards we imported the template and created a new VM with 80 vCPU ( 2 sockets * 40 vCPU ).

      Nothing of the above helped when we are inside the VM lscpu shows:
      7e6b5d05-1d3a-40cf-8254-c1e1f43a59a7-image.png

      Is there any other parameter to force "Threads per core or Numa Nodes" Pass through ?

      Best regards
      Operator from hell

      ForzaF 1 Reply Last reply Reply Quote 0
      • ForzaF Online
        Forza @sapcode
        last edited by Forza

        @sapcode said in XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching:

        However if we assign all 80 CPU's to a VM SLES or Ubuntu Server when we fire lscpu it always shows 64 and only 1 NUMA node.

        Perhaps the Guest kernel is compiled with max cpus=64
        9d31f332-647f-4a3e-ae30-2dfe1de20ce6-image.png
        3117686e-19b4-4c5a-8046-6a184bea18ba-image.png

        Edit: My Ubuntu 20.04 server VM uses 8192 as NR_CPUS

        CONFIG_NR_CPUS_RANGE_BEGIN=8192
        CONFIG_NR_CPUS_RANGE_END=8192
        CONFIG_NR_CPUS_DEFAULT=8192
        CONFIG_NR_CPUS=8192
        
        S 1 Reply Last reply Reply Quote 0
        • S Offline
          sapcode @Forza
          last edited by sapcode

          @s-pam The defaults at my ubuntu server looks like this:
          CONFIG_NUMA=y
          CONFIG_AMD_NUMA=y
          CONFIG_X86_64_ACPI_NUMA=y
          CONFIG_NODES_SPAN_OTHER_NODES=y
          CONFIG_NUMA_EMU=y
          CONFIG_NODES_SHIFT=10
          CONFIG_NR_CPUS=8192

          ForzaF 1 Reply Last reply Reply Quote 0
          • ForzaF Online
            Forza @sapcode
            last edited by

            @sapcode said in XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching:

            @s-pam The defaults at my ubuntu server looks like this:
            CONFIG_NUMA=y
            CONFIG_AMD_NUMA=y
            CONFIG_X86_64_ACPI_NUMA=y
            CONFIG_NODES_SPAN_OTHER_NODES=y
            CONFIG_NUMA_EMU=y
            CONFIG_NODES_SHIFT=10
            CONFIG_NR_CPUS=8192

            I found this https://docs.citrix.com/en-us/citrix-hypervisor/system-requirements/configuration-limits.html which seems to indicate an upper limit on vcpus per guest.

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            • olivierlambertO Offline
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              This is an "officially supported scope" limit but not a technical one. However, things could get weird with more CPUs. For Linux guest, that should be OK in theory, but never tried with more than 64.

              S 1 Reply Last reply Reply Quote 0
              • S Offline
                sapcode @olivierlambert
                last edited by sapcode

                @olivierlambert said in XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching:

                This is an "officially supported scope" limit but not a technical one. However, things could get weird with more CPUs. For Linux guest, that should be OK in theory, but never tried with more than 64.

                Hi Oliver,
                "officially supported scope" limit, means XCP is also following the 32 vcpu limit of citrix ?

                Does "Not a technical one" means there are some hacks possible to overcome 32 vcpu limit, i would be glad to do beta testing here and go up to 40 vcpu if you tell me where to write the hack.

                The machine is running multiple SAP HANA 2.0 SP4 instances and acts as a pure development, demo box so we would have no trouble in testing any hacky stuff to overcome that 32 vcpu limit.

                Let me know your thougts, we can also schedule a remote teams session if needed.

                Best regards
                Operator from hell

                ForzaF 1 Reply Last reply Reply Quote 0
                • ForzaF Online
                  Forza @sapcode
                  last edited by

                  @sapcode I've used 48 cores on my EPYC servers so I know this works. Didn't have a chance to test >64 cores though.

                  S 1 Reply Last reply Reply Quote 0
                  • olivierlambertO Offline
                    olivierlambert Vates 🪐 Co-Founder CEO
                    last edited by

                    The 32 vCPU limit is only implemented in XenCenter/XCP-ng Center, not in Xen Orchestra nor XAPI.

                    So we do not enforce anything, and there's no "hack".

                    I discussed that with Xen devs back in the days, and they told me that Windows guest could get funky behaviour with more than 32 vCPUs, Linux is higher. It's due to complex interactions with VMs and Xen. I have 0 idea for FreeBSD for example.

                    As @S-Pam said, I already seen people with 48 cores or so, but higher than 64 is a bit unusual, so I have near 0 knowledge on how it might behave there.

                    S 2 Replies Last reply Reply Quote 0
                    • S Offline
                      sapcode @Forza
                      last edited by

                      @s-pam 48 cores in double or single socket ?
                      We have got 40 cores * 2 Sockets, so it looks like the citrix limit is 32 vcpu per socket....

                      ForzaF 1 Reply Last reply Reply Quote 0
                      • ForzaF Online
                        Forza @sapcode
                        last edited by

                        @sapcode said in XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching:

                        @s-pam 48 cores in double or single socket ?
                        We have got 40 cores * 2 Sockets, so it looks like the citrix limit is 32 vcpu per socket....

                        Single socket EPYC servers.

                        1 Reply Last reply Reply Quote 0
                        • S Offline
                          sapcode @olivierlambert
                          last edited by

                          @olivierlambert said in XCP 8.2 VCPUs-max=80 but VM shows 64 CPU only, NUMA nodes and Threads per core not matching:

                          I hav

                          Hi Oliver,

                          we have only SUSE & RedHat Linux guest VM's so i have a good feeling 2 x 40 vCPU should be no issue.

                          We tried Xen Orchestra, the assignment of 80 Cpu ( 2 sockets x 40 ) works like in XCP-ng Center, but after booting the Ubuntu 20 server - lscpu shows again 64 vCPU and only 1 NUMA node.

                          Let me know if you want to check settings at our landscape, we can do a remote screenshare with Microsoft Teams / Zoom.

                          Best regards

                          1 Reply Last reply Reply Quote 0
                          • S Offline
                            sapcode @olivierlambert
                            last edited by sapcode

                            @olivierlambert The strange thing is follwing, all vCPU's and NUMA nodes are shown correctly in xl info:

                            xl info -n
                            host                   : xcpng82
                            release                : 4.19.0+1
                            version                : #1 SMP Tue Mar 30 22:34:15 CEST 2021
                            machine                : x86_64
                            nr_cpus                : 80
                            max_cpu_id             : 79
                            nr_nodes               : 2
                            cores_per_socket       : 20
                            threads_per_core       : 2
                            cpu_mhz                : 2300.006
                            hw_caps                : bfebfbff:77fef3ff:2c100800:00000121:00000001:001cbfbb:00000000:00000100
                            virt_caps              : pv hvm hvm_directio pv_directio hap shadow iommu_hap_pt_share
                            total_memory           : 786321
                            free_memory            : 14403
                            sharing_freed_memory   : 0
                            sharing_used_memory    : 0
                            outstanding_claims     : 0
                            free_cpus              : 0
                            cpu_topology           :
                            cpu:    core    socket     node
                              0:       0        0        0
                              1:       0        0        0
                              2:       1        0        0
                              3:       1        0        0
                              4:       2        0        0
                              5:       2        0        0
                              6:       3        0        0
                              7:       3        0        0
                              8:       4        0        0
                              9:       4        0        0
                             10:       8        0        0
                             11:       8        0        0
                             12:       9        0        0
                             13:       9        0        0
                             14:      10        0        0
                             15:      10        0        0
                             16:      11        0        0
                             17:      11        0        0
                             18:      12        0        0
                             19:      12        0        0
                             20:      16        0        0
                             21:      16        0        0
                             22:      17        0        0
                             23:      17        0        0
                             24:      18        0        0
                             25:      18        0        0
                             26:      19        0        0
                             27:      19        0        0
                             28:      20        0        0
                             29:      20        0        0
                             30:      24        0        0
                             31:      24        0        0
                             32:      25        0        0
                             33:      25        0        0
                             34:      26        0        0
                             35:      26        0        0
                             36:      27        0        0
                             37:      27        0        0
                             38:      28        0        0
                             39:      28        0        0
                             40:       0        1        1
                             41:       0        1        1
                             42:       1        1        1
                             43:       1        1        1
                             44:       2        1        1
                             45:       2        1        1
                             46:       3        1        1
                             47:       3        1        1
                             48:       4        1        1
                             49:       4        1        1
                             50:       8        1        1
                             51:       8        1        1
                             52:       9        1        1
                             53:       9        1        1
                             54:      10        1        1
                             55:      10        1        1
                             56:      11        1        1
                             57:      11        1        1
                             58:      12        1        1
                             59:      12        1        1
                             60:      16        1        1
                             61:      16        1        1
                             62:      17        1        1
                             63:      17        1        1
                             64:      18        1        1
                             65:      18        1        1
                             66:      19        1        1
                             67:      19        1        1
                             68:      20        1        1
                             69:      20        1        1
                             70:      24        1        1
                             71:      24        1        1
                             72:      25        1        1
                             73:      25        1        1
                             74:      26        1        1
                             75:      26        1        1
                             76:      27        1        1
                             77:      27        1        1
                             78:      28        1        1
                             79:      28        1        1
                            device topology        :
                            device           node
                            0000:03:00.0      0
                            0000:83:04.0      1
                            0000:00:1f.2      0
                            0000:00:1c.0      0
                            0000:09:00.0      0
                            0000:84:00.0      1
                            0000:00:04.4      0
                            0000:80:05.2      1
                            0000:80:02.0      1
                            0000:00:1f.0      0
                            0000:83:0c.0      1
                            0000:02:00.0      0
                            0000:00:04.2      0
                            0000:00:01.0      0
                            0000:80:05.0      1
                            0000:80:04.6      1
                            0000:08:00.0      0
                            0000:83:00.0      1
                            0000:00:04.0      0
                            0000:80:04.4      1
                            0000:00:16.0      0
                            0000:01:00.0      0
                            0000:82:00.0      1
                            0000:80:04.2      1
                            0000:80:01.0      1
                            0000:00:05.1      0
                            0000:04:08.0      0
                            0000:00:04.7      0
                            0000:00:1f.3      0
                            0000:00:00.0      0
                            0000:80:04.0      1
                            0000:04:10.0      0
                            0000:00:04.5      0
                            0000:06:00.0      0
                            0000:81:00.0      1
                            0000:00:03.0      0
                            0000:87:00.0      1
                            0000:02:00.1      0
                            0000:00:04.3      0
                            0000:80:05.1      1
                            0000:00:1a.0      0
                            0000:00:11.4      0
                            0000:80:04.7      1
                            0000:05:00.0      0
                            0000:00:04.1      0
                            0000:00:1d.0      0
                            0000:80:04.5      1
                            0000:86:00.0      1
                            0000:00:05.4      0
                            0000:00:16.1      0
                            0000:01:00.1      0
                            0000:83:08.0      1
                            0000:00:11.0      0
                            0000:80:04.3      1
                            0000:00:05.2      0
                            0000:00:02.0      0
                            0000:85:00.0      1
                            0000:00:14.0      0
                            0000:80:04.1      1
                            0000:00:1c.2      0
                            0000:00:05.0      0
                            0000:00:04.6      0
                            0000:80:05.4      1
                            numa_info              :
                            node:    memsize    memfree    distances
                               0:    395264       9023      10,21
                               1:    393216       5379      21,10
                            xen_major              : 4
                            xen_minor              : 13
                            xen_extra              : .1-9.9.1
                            xen_version            : 4.13.1-9.9.1
                            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          : 6278553325a9, pq 70d4b5941e4f
                            xen_commandline        : dom0_mem=8192M,max:8192M watchdog ucode=scan crashkernel=256M,below=4G console=vga vga=mode-0x0311 cpuid=no-ibrsb,no-ibpb,no-stibp bti=thunk=jmp,rsb_native=no,rsb_vmexit=no xpti=no cpufreq=xen:performance max_cstate=0 nospec_store_bypass_disable noibrs noibpb nopti l1tf=off mitigations=off spectre_v2_user=off spectre_v2=off nospectre_v2 nospectre_v1 no_stf_barrier mds=off spec-ctrl=no dom0_max_vcpus=1-1
                            cc_compiler            : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
                            cc_compile_by          : mockbuild
                            cc_compile_domain      : [unknown]
                            cc_compile_date        : Thu Feb  4 18:23:36 CET 2021
                            build_id               : a76c6ee84d87600fa0d520cd8ecb8113b1105af4
                            xend_config_format     : 4
                            

                            But in xl vcpu-list for the specific VM "0__SAP S4H S4HANA 2.0 1709 SP4" for the vCPU 64-79 the state looks strange:

                            # xl vcpu-list
                            [10:35 xcpng82 ~]# xl vcpu-list
                            Name                                ID  VCPU   CPU State   Time(s) Affinity (Hard / Soft)
                            Domain-0                             0     0   79   r--     257.2  all / all
                            0__Confluence & Jira & Gitlab        1     0   40   -b-     142.2  all / all
                            0__Confluence & Jira & Gitlab        1     1   19   -b-     142.8  all / all
                            0__Confluence & Jira & Gitlab        1     2   65   -b-     141.5  all / all
                            0__Confluence & Jira & Gitlab        1     3   70   -b-     136.8  all / all
                            0__Confluence & Jira & Gitlab        1     4   34   -b-     138.2  all / all
                            0__Confluence & Jira & Gitlab        1     5    3   -b-     141.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     0   76   -b-      47.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     1   64   -b-      25.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     2   23   -b-      25.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     3   28   -b-      22.8  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     4   32   -b-      34.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     5   53   -b-      53.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     6   11   -b-      36.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     7    7   -b-      35.4  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     8   12   -b-      39.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2     9   55   -b-      26.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    10   49   -b-      26.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    11   20   -b-      28.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    12   60   -b-      41.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    13   43   -b-      22.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    14   69   -b-      29.8  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    15   36   -b-      24.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    16   62   -b-      28.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    17   37   -b-      28.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    18   66   -b-      26.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    19   10   -b-      22.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    20   68   -b-      30.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    21   13   -b-      28.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    22   38   -b-      21.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    23   27   -b-      24.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    24   46   -b-      28.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    25   74   -b-      24.8  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    26   52   -b-      23.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    27   56   -b-      23.8  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    28   35   -b-      29.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    29   77   -b-      25.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    30   57   -b-      19.4  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    31   47   -b-      26.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    32   51   -b-      27.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    33   54   -b-      43.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    34   71   -b-      23.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    35   67   -b-      22.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    36   22   -b-      25.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    37   15   -b-      21.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    38   75   -b-      24.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    39    2   -b-      23.4  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    40   58   -b-      28.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    41   73   -b-      23.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    42   16   -b-      24.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    43   17   -b-      21.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    44   26   -b-      31.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    45   78   -b-      21.3  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    46    9   -b-      20.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    47   18   -b-      21.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    48   42   -b-      28.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    49   50   -b-      22.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    50   45   -b-      23.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    51   61   -b-      23.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    52   44   -b-      28.2  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    53   30   -b-      24.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    54    5   -b-      24.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    55   24   -b-      27.6  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    56   29   -b-      30.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    57   14   -b-      26.9  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    58   33   -b-      21.4  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    59    4   -b-      24.4  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    60   45   -b-      29.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    61   72   -b-      28.1  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    62    0   -b-      24.5  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    63   41   -b-      22.7  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    64    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    65    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    66    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    67    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    68    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    69    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    70    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    71    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    72    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    73    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    74    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    75    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    76    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    77    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    78    -   --p       0.0  all / all
                            0__SAP S4H S4HANA 2.0 1709 SP4       2    79    -   --p       0.0  all / all
                            
                            

                            Can you see the "State" flag "-b-" for CPU 1-63 seems okbut for CPU 64-79 it says "--p" what does that mean ?

                            Best regards

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                              sapcode @sapcode
                              last edited by

                              @sapcode
                              Found a description here: https://linux.die.net/man/1/xm
                              But no idea why it starts some CPUs in the pause state....
                              Will do some testing with C states and govenor performance....

                              STATES

                              The State field lists 6 states for a Xen Domain, and which ones the current Domain is in.
                              r - running      The domain is currently running on a CPU
                              b - blocked     The domain is blocked, and not running or runnable. This can be caused because the domain is waiting on IO (a traditional wait state) or has gone to sleep because there was nothing else for it to do.
                              p - paused       The domain has been paused, usually occurring through the administrator running xm pause. When in a paused state the domain will still consume allocated resources like memory, but will not be eligible for scheduling by the Xen hypervisor.
                              s - shutdown   The guest has requested to be shutdown, rebooted or suspended, and the domain is in the process of being destroyed in response.
                              c - crashed      The domain has crashed, which is always a violent ending. Usually this state can only occur if the domain has been configured not to restart on crash. See xmdomain.cfg for more info.
                              d - dying         The domain is in process of dying, but hasn't completely shutdown or crashed.

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