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Ok thanks
I still do not fully understand why I see the problem with nova 1.25.2:1
while it works with v. 1.25.2:0 (without changing any other packages).
According to the release notes only this change [*] was introduced


[*] https://bugs.launchpad.net/nova/+bug/1941005

Cheers, Massimo

On Fri, Oct 6, 2023 at 12:25 PM <smooney at redhat.com> wrote:

> On Fri, 2023-10-06 at 09:04 +0200, Massimo Sgaravatto wrote:
> > Thanks for your answer
> >
> > I guess you are referring to the cpu_shares in the flavor quota [*]
> >
> > Actually I never explicitly set a value of cpu_shares in the flavor ...
> if you are seeing this for instance where its not explictly in the falvor
> then
> this is form the old behavior where we set a default share value as
> flavor.vcpus *1000
> in newer version of openstack we never set an implict value
>
> https://github.com/openstack/nova/commit/f77a9fee5b736899ecc39d33e4f4e4012cee751cthis
> change is aviable in zed+
> i know this has been backported downstream to wallaby so its possibel to do
> i belive there was consern with upstream backporting do to cpu starvation
> if you were hevialy using this funtionatlity. that is why it was not
> backported
> upstream in the past but you could apply it too your own cloud.
>
> >
> >
> > [*] https://docs.openstack.org/nova/yoga/admin/resource-limits.html
> >
> > On Thu, Oct 5, 2023 at 9:17 PM <smooney at redhat.com> wrote:
> >
> > > On Thu, 2023-10-05 at 16:53 +0200, Massimo Sgaravatto wrote:
> > > > Dear all
> > > >
> > > > We have recently updated openstack nova on some AlmaLinux9 compute
> nodes
> > > > running Yoga from 1:25.2.0 to 1.25.2.1. After this operation some VMs
> > > don't
> > > > start anymore. In the log it is reported:
> > > >
> > > > libvirt.libvirtError: invalid argument: shares \'57344\' must be in
> range
> > > > [1, 10000]\n'}
> > > >
> > > > libvirt version is 9.0.0-10.3
> > > >
> > > >
> > > > A quick google search suggests that it is something related to
> cgroups
> > > and
> > > > it is fixed in libvirt >= 9.1 (which is not yet in the almalinux9
> repos).
> > > > Did I get it right ?
> > > not quite
> > >
> > > it is reated to cgroups but the cause is that in cgroups_v1 the
> maxvlaue
> > > of shares
> > > i.e. cpu_shares changed form make int to 10000 in cgroups_v2
> > > so the issue is teh vm requested a cpu share value of 57344 which is
> not
> > > vlaid on an OS
> > > that is useing cgroups_v2 libvirt will not clamp the value nor will
> nova.
> > > you have to change the volue in your flavor and resize the vm.
> > >
> > > >
> > > >
> > > >
> > > > Thanks, Massimo
> > >
> > >
>
>
>
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