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Re: [xen-4.12-testing test] 169199: regressions - FAIL
- To: Julien Grall <julien@xxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 8 Apr 2022 13:16:21 +0200
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, osstest service owner <osstest-admin@xxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Apr 08, 2022 at 12:08:02PM +0100, Julien Grall wrote:
> Hi,
>
> On 08/04/2022 12:01, Roger Pau Monné wrote:
> > > > I could add a suitable dom0_max_vcpus parameter to osstest. XenServer
> > > > uses 16 for example.
> > >
> > > I'm afraid a fixed number won't do, the more that iirc there are
> > > systems with just a few cores in the pool (and you don't want to
> > > over-commit by default).
> >
> > But this won't over commit, it would just assign dom0 16 vCPUs at
> > most, if the system has less than 16 vCPUs that's what would be
> > assigned to dom0.
>
> AFAICT, this is not the case on Arm. If you ask 16 vCPUs, then you will get
> that number even if there are 8 pCPUs.
>
> In fact, the documentation of dom0_max_vcpus suggests that the numbers of
> vCPUs can be more than the number of pCPUs.
It was my understanding that you could only achieve that by using the
min-max nomenclature, so in order to force 16 vCPUs always you would
have to use:
dom0_max_vcpus=16-16
Otherwise the usage of '_max_' in the option name is pointless, and it
should instead be dom0_vcpus.
Anyway, I could use:
dom0_max_vcpus=1-16
Which is unambiguous and should get us 1 vCPU at least, or 16vCPUs at
most.
But given Jans suggestion we might want to go for something more
complex?
Thanks, Roger.
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