slow VMs on compute node [closed]

asked 2017-07-12 02:45:09 -0600

AB239
63 ●21 ●25 ●31

Hello,

I am using OpenStack Newton release with following configuration: 1 Virtual Controller node 2 Virtual Swift nodes 2 Physical Compute Nodes (Node A: 96GB RAM , 24 CPUs [Intel(R) Xeon(R) CPU E5-2420 0 @ 1.90GHz ]; Node B: 128GB RAM, 32 CPUs [Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz])

Problem Statement:

After launching a stack of around 30 instances through Horizon, VMs get distributed to Compute Nodes A and B. To my surprise, VMs on compute A complete their cloud-config in no time (approx 300 seconds) while the same cloud-config completion time in VM on compute node B takes around 2000 seconds.

Nova-compute.conf are similar on both the Compute nodes and so are nova.conf files. What could be possible cause?

Regards AB

Closed for the following reason question is not relevant or outdated by AB239
close date 2018-03-16 02:35:03.354501

answered 2017-07-12 15:40:48 -0600

Laurent_bcn
51 ●1 ●2

updated 2017-07-12 15:43:00 -0600

The virt type should be kvm in the conf file :

/etc/nova/nova-compute.conf

[DEFAULT]
compute_driver=libvirt.LibvirtDriver
[libvirt]
virt_type=kvm

And enable Intel VT and AMD-V virtualization hardware extensions in BIOS

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Hi.. I do have virt_type as kvm in nova-compute on both the compute nodes.. Intel VT and AMD-V virtualization extensions are also enabled.

AB239 ( 2017-07-14 02:50:09 -0600 )edit

Also cat /proc/cpuinfo | grep vmx returns an output but cat /proc/cpuinfo | grep svm doesn't. Does this mean either all hardware extensions aren't enabled. But I have Intel processors on both compute nodes so don't think SVM extension will be available in BIOS.

AB239 ( 2017-07-14 02:53:50 -0600 )edit

Hello, In order to be sure that is a cpu issue, could you make a little bench on VMs to see if there is a difference,:

dd if=/dev/zero bs=1M count=1024 | md5sum

Laurent_bcn ( 2017-07-17 18:28:20 -0600 )edit

compute 1(faster):

1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 4.05739 s, 265 MB/s

compute 2(actually slower) :

1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.90885 s, 369 MB/s

AB239 ( 2017-07-19 08:23:43 -0600 )edit

So this is not a CPU issue ...

Could you check the access to the metadata url which is used by cloud-init :

   time  curl http://169.254.169.254/latest/meta-data/

Laurent_bcn ( 2017-07-19 09:00:36 -0600 )edit

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Closed for the following reason question is not relevant or outdated by AB239
close date 2018-03-16 02:35:03.354501

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slow VMs on compute node [closed] edit

Closed for the following reason question is not relevant or outdated by AB239 close date 2018-03-16 02:35:03.354501

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slow VMs on compute node [closed]

Closed for the following reason question is not relevant or outdated by AB239
close date 2018-03-16 02:35:03.354501