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    • C
      Fixes related to processing of qemu's -numa option · ee785fed
      Chegu Vinod 提交于
      The -numa option to qemu is used to create [fake] numa nodes
      and expose them to the guest OS instance.
      
      There are a couple of issues with the -numa option:
      
      a) Max VCPU's that can be specified for a guest while using
         the qemu's -numa option is 64. Due to a typecasting issue
         when the number of VCPUs is > 32 the VCPUs don't show up
         under the specified [fake] numa nodes.
      
      b) KVM currently has support for 160VCPUs per guest. The
         qemu's -numa option has only support for upto 64VCPUs
         per guest.
      This patch addresses these two issues.
      
      Below are examples of (a) and (b)
      
      a) >32 VCPUs are specified with the -numa option:
      
      /usr/local/bin/qemu-system-x86_64 \
      -enable-kvm \
      71:01:01 \
      -net tap,ifname=tap0,script=no,downscript=no \
      -vnc :4
      
      ...
      Upstream qemu :
      --------------
      
      QEMU 1.1.50 monitor - type 'help' for more information
      (qemu) info numa
      6 nodes
      node 0 cpus: 0 1 2 3 4 5 6 7 8 9 32 33 34 35 36 37 38 39 40 41
      node 0 size: 131072 MB
      node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51
      node 1 size: 131072 MB
      node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59
      node 2 size: 131072 MB
      node 3 cpus: 30
      node 3 size: 131072 MB
      node 4 cpus:
      node 4 size: 131072 MB
      node 5 cpus: 31
      node 5 size: 131072 MB
      
      With the patch applied :
      -----------------------
      
      QEMU 1.1.50 monitor - type 'help' for more information
      (qemu) info numa
      6 nodes
      node 0 cpus: 0 1 2 3 4 5 6 7 8 9
      node 0 size: 131072 MB
      node 1 cpus: 10 11 12 13 14 15 16 17 18 19
      node 1 size: 131072 MB
      node 2 cpus: 20 21 22 23 24 25 26 27 28 29
      node 2 size: 131072 MB
      node 3 cpus: 30 31 32 33 34 35 36 37 38 39
      node 3 size: 131072 MB
      node 4 cpus: 40 41 42 43 44 45 46 47 48 49
      node 4 size: 131072 MB
      node 5 cpus: 50 51 52 53 54 55 56 57 58 59
      node 5 size: 131072 MB
      
      b) >64 VCPUs specified with -numa option:
      
      /usr/local/bin/qemu-system-x86_64 \
      -enable-kvm \
      -cpu Westmere,+rdtscp,+pdpe1gb,+dca,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pclmuldq,+pbe,+tm,+ht,+ss,+acpi,+d-vnc :4
      
      ...
      
      Upstream qemu :
      --------------
      
      only 63 CPUs in NUMA mode supported.
      only 64 CPUs in NUMA mode supported.
      QEMU 1.1.50 monitor - type 'help' for more information
      (qemu) info numa
      8 nodes
      node 0 cpus: 6 7 8 9 38 39 40 41 70 71 72 73
      node 0 size: 65536 MB
      node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51 74 75 76 77 78 79
      node 1 size: 65536 MB
      node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59 60 61
      node 2 size: 65536 MB
      node 3 cpus: 30 62
      node 3 size: 65536 MB
      node 4 cpus:
      node 4 size: 65536 MB
      node 5 cpus:
      node 5 size: 65536 MB
      node 6 cpus: 31 63
      node 6 size: 65536 MB
      node 7 cpus: 0 1 2 3 4 5 32 33 34 35 36 37 64 65 66 67 68 69
      node 7 size: 65536 MB
      
      With the patch applied :
      -----------------------
      
      QEMU 1.1.50 monitor - type 'help' for more information
      (qemu) info numa
      8 nodes
      node 0 cpus: 0 1 2 3 4 5 6 7 8 9
      node 0 size: 65536 MB
      node 1 cpus: 10 11 12 13 14 15 16 17 18 19
      node 1 size: 65536 MB
      node 2 cpus: 20 21 22 23 24 25 26 27 28 29
      node 2 size: 65536 MB
      node 3 cpus: 30 31 32 33 34 35 36 37 38 39
      node 3 size: 65536 MB
      node 4 cpus: 40 41 42 43 44 45 46 47 48 49
      node 4 size: 65536 MB
      node 5 cpus: 50 51 52 53 54 55 56 57 58 59
      node 5 size: 65536 MB
      node 6 cpus: 60 61 62 63 64 65 66 67 68 69
      node 6 size: 65536 MB
      node 7 cpus: 70 71 72 73 74 75 76 77 78 79
      Signed-off-by: NChegu Vinod &lt;chegu_vinod@hp.com&gt;, Jim Hull &lt;jim.hull@hp.com&gt;, Craig Hada <craig.hada@hp.com>
      Tested-by: NEduardo Habkost <ehabkost@redhat.com>
      Reviewed-by: NEduardo Habkost <ehabkost@redhat.com>
      Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
      ee785fed
  12. 03 8月, 2012 1 次提交