Open Stack

On Fri, 2020-03-06 at 07:57 +0000, Juntingqiu Qiujunting (邱军婷) wrote:
> When I create a instance using a flavor with "hw:cpu_policy=dedicated" "hw:cpu_realtime=yes" and
> "hw:cpu_realtime_mask=^0-1".
> 
> 
> 
> The error is "libvirtError:Cannot set scheduler parameters for pid 3666:operation not permitted".
i would guess that ytou are hiting an selinux or apparmor issue.
in either case this is not a nova/openstack bug but rather a libvirt/host os configuration issue.

i would check the output of dmesg and see if there are any messages that relate to this.
> 
> 
> 
> https://bugs.launchpad.net/starlingx/+bug/1866311
> 
> 
> 
> The instance xml as following:
> 
> <vcpu placement='static'>4</vcpu>
>   <cputune>
>     <vcpupin vcpu='0' cpuset='3'/>
>     <vcpupin vcpu='1' cpuset='11'/>
>     <vcpupin vcpu='2' cpuset='0'/>
>     <vcpupin vcpu='3' cpuset='8'/>
>     <emulatorpin cpuset='3,11'/>
>     <vcpusched vcpus='2' scheduler='fifo' priority='1'/>
>     <vcpusched vcpus='3' scheduler='fifo' priority='1'/>
>   </cputune>
> 
> The error log as following:
> 
>  ERROR nova.compute.manager [instance: 74dcc0a1-9ed4-4d13-bef7-ac9623bca2d0] File "/usr/lib64/python2.7/site-
> packages/libvirt.py", line 1099, in createWithFlags
>  ERROR nova.compute.manager [instance: 74dcc0a1-9ed4-4d13-bef7-ac9623bca2d0] if ret == -1: raise libvirtError
> ('virDomainCreateWithFlags() failed', dom=self)
>  ERROR nova.compute.manager [instance: 74dcc0a1-9ed4-4d13-bef7-ac9623bca2d0] libvirtError: Cannot set scheduler
> parameters for pid 6504: Operation not permitted
>  ERROR nova.compute.manager [instance: 74dcc0a1-9ed4-4d13-bef7-ac9623bca2d0]
> 
> 
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> 
>