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I think the immediate solution would be to just set cpu_allocation_ratio 
to 16.0 in the nova.CONF that your CI system is using.

Best,
-jay

On 08/29/2018 05:26 AM, Naichuan Sun wrote:
> Hi, Eric and Jay,
> 
> The VCPU/Disk/RAM allocation ratio are set to 0.0 by default, and resource tracker would reset it to valid values in  https://github.com/openstack/nova/blob/master/nova/objects/compute_node.py#L199.
> But it looks the value is set back to 0.0 by some function(I'm not sure who does it...), so xenserver CI is broken. Any suggestion about that?
> Looks libvirt works well, do they set allocation ratio in the configure file?
> 
> Thank you very much.
> 
> BR.
> Naichuan Sun
> 
> -----Original Message-----
> From: Naichuan Sun
> Sent: Wednesday, August 29, 2018 7:00 AM
> To: OpenStack Development Mailing List (not for usage questions) <openstack-dev at lists.openstack.org>
> Subject: RE: [openstack-dev] [nova] [placement] XenServer CI failed frequently because of placement update
> 
> Thank you very much for the help, Bob, Jay and Eric.
> 
> Naichuan Sun
> 
> -----Original Message-----
> From: Bob Ball [mailto:bob.ball at citrix.com]
> Sent: Wednesday, August 29, 2018 12:22 AM
> To: OpenStack Development Mailing List (not for usage questions) <openstack-dev at lists.openstack.org>
> Subject: Re: [openstack-dev] [nova] [placement] XenServer CI failed frequently because of placement update
> 
>> Yeah, the nova.CONF cpu_allocation_ratio is being overridden to 0.0:
> 
> The default there is 0.0[1] - and the passing tempest-full from Zuul on https://review.openstack.org/#/c/590041/ has the same line when reading the config[2]:
> 
> We'll have a dig to see if we can figure out why it's not defaulting to 16 in the ComputeNode.
> 
> Thanks!
> 
> Bob
> 
> [1] https://git.openstack.org/cgit/openstack/nova/tree/nova/conf/compute.py#n386
> [2] http://logs.openstack.org/41/590041/17/check/tempest-full/b3f9ddd/controller/logs/screen-n-cpu.txt.gz#_Aug_27_14_18_24_078058
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