Re: [Xen-devel] [v4][PATCH 11/19] tools: introduce some new parameters to set rdm policy

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

> > > 1. By default, the domain policy is RELAXED (See above,
> > > libxl__rdm_setdefault()).
> > >
> > > 2. By default, the policy for individual devices is STRICT (see
> > > libxl_pci.c:libxl__device_pci_setdefault())
> > >
> > > 3. If the domain policy is set to STRICT, this overrides per-device
> > > policy
> > >
> > > 4. If the domain policy is set to RELAXED, I don't see that having an
> > > effect on individual devices
> > This is our rule, and this is why I think you need to take a look at
> > patch #00, our design and all patch head descriptions,
> >
> > "Default per-device RDM policy is 'strict', while default global RDM
> > policy is 'relaxed'. When both policies are specified on a given region,
> > 'strict' is always preferred."
> It looks like you didn't finish reading my message.  I suggest you do so:
Okay.

> > > If I'm correct, then #3 means it's not possible to have devices for a
> > > domain *default* to strict, but to be relaxed in individual instances.
> > > If you had five devices you wanted strict, and only one device you
> > > wanted to be relaxed (because you knew it didn't matter), you'd have
> > > to set reserved=strict for all the other devices, rather than just
> > > being able to set the domain setting to strict and set reserve=relaxed
> > > for the one.
> > >
> > > I think that both violates the principle of least surprise, and is
> > > less useful.
So what's you idea to follow our requirement?

Thanks
Tiejun

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