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[Bug 1515490] [NEW] It must be less than cores per socket of host，when specify the VM ’s single numa_node vcpus is odd number（cpu_policy=dedicated）

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: jinquanni（ZTE） <ni.jinquan@xxxxxxxxxx>
Date: Thu, 12 Nov 2015 05:46:59 -0000
Reply-to: Bug 1515490 <1515490@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:


1. version
kilo 2015.1.0

2. Relevant log files:
nova-scheduler.log
2015-11-12 12:56:50.472 27408 INFO nova.filters [req-70882f90-d48e-4ca0-8b09-b15a82df792f 9c67877ee37b47e989148a776862c7b8 40fc54dc632c4a02b44bf31d7ff15c82 - - -] Filter NUMATopologyFilter returned 0 hosts for instance 890d0215-5033-44ac-bb8c-3b90ce0db6a4

3. Reproduce steps:

3.1  environment described

I have one compute node  with 32 cpus，

It’s numa_topology is as follows：
2 sockets * 8 cores * 2 thread = 32 

this mean this host have 2 numa_node，and have 16 cpu on per numa_node

3.2 create a flavor  with 30 cpus：

[root@nail-SBCJ-5-3-13 nova(keystone_admin)]# nova flavor-show 30cpu
+----------------------------+-------+
| Property                   | Value |
+----------------------------+-------+
| OS-FLV-DISABLED:disabled   | False |
| OS-FLV-EXT-DATA:ephemeral  | 0     |
| disk                       | 1     |
| extra_specs                | {}    |
| id                         | 7     |
| name                       | 30cpu |
| os-flavor-access:is_public | True  |
| ram                        | 512   |
| rxtx_factor                | 1.0   |
| swap                       |       |
| vcpus                      | 30    |
+----------------------------+-------+
3.3 Set the numa properties as follows（numa_node1:15 vcpu numa_node2:15 vcpu），then，create vm use the flavor
nova flavor-key 30cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-14" hw:numa_mem.0=256 hw:numa_cpus.1="15-29" hw:numa_mem.1=256 hw:cpu_policy=dedicated
Expected result: create success
Actual result ： create failed  
Error log: ----> 2. Relevant log files

3.4 Set the numa properties  as follows again（numa_node1: 14 vcpu numa_node2: 16 vcpu），then，create vm use the flavor
nova flavor-key 30cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-13" hw:numa_mem.0=256 hw:numa_cpus.1="14-29" hw:numa_mem.1=256 hw:cpu_policy=dedicated
Expected result: create success
Actual result ： create success

3.5 create another flavor with 14 cpus（numa_node1:7 vcpu numa_node2:7 vcpu），Set the numa properties as follows，then，create vm use the flavor
nova flavor-key 14cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-6" hw:numa_mem.0=256 hw:numa_cpus.1="7-13" hw:numa_mem.1=256 hw:cpu_policy=dedicated
Expected result: create success
Actual result ： create success
 
 OR （numa_node1：6 vcpu numa_node2:8 vcpu）
 
nova flavor-key 14cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-5" hw:numa_mem.0=256 hw:numa_cpus.1="6-13" hw:numa_mem.1=256 hw:cpu_policy=dedicated
Expected result: create success
Actual result ： create success
 
4 
The above results show that：
It must be less than cores per socket of host，when specify the VM ’s single numa_node vcpus is odd number （when cpu pining policy = dedicated）。
but if the number is even number does not exist this kind of situation。
I don't think it is reasonable

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: numa

** Summary changed:

- It must be less than cores per socket of host，when specify the VM ’s single numa_node vcpus is odd number
+ It must be less than cores per socket of host，when specify the VM ’s single numa_node vcpus is odd number（cpu_policy=dedicated）

-- 
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1515490

Title:
  It must be less than cores per socket of host，when specify the VM ’s
  single numa_node vcpus is odd number（cpu_policy=dedicated）

Status in OpenStack Compute (nova):
  New

Bug description:
  
  1. version
  kilo 2015.1.0

  2. Relevant log files:
  nova-scheduler.log
  2015-11-12 12:56:50.472 27408 INFO nova.filters [req-70882f90-d48e-4ca0-8b09-b15a82df792f 9c67877ee37b47e989148a776862c7b8 40fc54dc632c4a02b44bf31d7ff15c82 - - -] Filter NUMATopologyFilter returned 0 hosts for instance 890d0215-5033-44ac-bb8c-3b90ce0db6a4

  3. Reproduce steps:

  3.1  environment described

  I have one compute node  with 32 cpus，

  It’s numa_topology is as follows：
  2 sockets * 8 cores * 2 thread = 32 

  this mean this host have 2 numa_node，and have 16 cpu on per numa_node

  3.2 create a flavor  with 30 cpus：

  [root@nail-SBCJ-5-3-13 nova(keystone_admin)]# nova flavor-show 30cpu
  +----------------------------+-------+
  | Property                   | Value |
  +----------------------------+-------+
  | OS-FLV-DISABLED:disabled   | False |
  | OS-FLV-EXT-DATA:ephemeral  | 0     |
  | disk                       | 1     |
  | extra_specs                | {}    |
  | id                         | 7     |
  | name                       | 30cpu |
  | os-flavor-access:is_public | True  |
  | ram                        | 512   |
  | rxtx_factor                | 1.0   |
  | swap                       |       |
  | vcpus                      | 30    |
  +----------------------------+-------+
  3.3 Set the numa properties as follows（numa_node1:15 vcpu numa_node2:15 vcpu），then，create vm use the flavor
  nova flavor-key 30cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-14" hw:numa_mem.0=256 hw:numa_cpus.1="15-29" hw:numa_mem.1=256 hw:cpu_policy=dedicated
  Expected result: create success
  Actual result ： create failed  
  Error log: ----> 2. Relevant log files

  3.4 Set the numa properties  as follows again（numa_node1: 14 vcpu numa_node2: 16 vcpu），then，create vm use the flavor
  nova flavor-key 30cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-13" hw:numa_mem.0=256 hw:numa_cpus.1="14-29" hw:numa_mem.1=256 hw:cpu_policy=dedicated
  Expected result: create success
  Actual result ： create success

  3.5 create another flavor with 14 cpus（numa_node1:7 vcpu numa_node2:7 vcpu），Set the numa properties as follows，then，create vm use the flavor
  nova flavor-key 14cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-6" hw:numa_mem.0=256 hw:numa_cpus.1="7-13" hw:numa_mem.1=256 hw:cpu_policy=dedicated
  Expected result: create success
  Actual result ： create success
   
   OR （numa_node1：6 vcpu numa_node2:8 vcpu）
   
  nova flavor-key 14cpu  set hw:numa_nodes=2 hw:numa_cpus.0="0-5" hw:numa_mem.0=256 hw:numa_cpus.1="6-13" hw:numa_mem.1=256 hw:cpu_policy=dedicated
  Expected result: create success
  Actual result ： create success
   
  4 
  The above results show that：
  It must be less than cores per socket of host，when specify the VM ’s single numa_node vcpus is odd number （when cpu pining policy = dedicated）。
  but if the number is even number does not exist this kind of situation。
  I don't think it is reasonable

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Follow ups

[Bug 1515490] Re: Fail to create instance when single numa_node vcpus that set in flavor is odd number (cpu_policy=dedicated）
From: Stephen Finucane, 2016-03-07