[libvirt] [PATCH] libxl: Add support for max_grant_frame setting

[Daniel P. Berrangé]

On Tue, Mar 05, 2019 at 02:42:51PM -0700, Jim Fehlig wrote:
> On 3/5/19 3:17 AM, Daniel P. Berrangé wrote:
> > On Mon, Mar 04, 2019 at 04:00:01PM -0700, Jim Fehlig wrote:
> > > Xen 4.10 introduced the max_grant_frames xl config setting, which
> > > can be set globally in xl.conf(5) or per-domain in xl.cfg(5).
> > > max_grant_frames specifies the maximum number of grant frames the
> > > domain is allowed to have, which in turn controls the number of
> > > pages the domain can share.
> > 
> > Does the grant frame value have any impact on the live migration
> > compatibility ? ie if both source and dest host are required to
> > have identical grant frame values, then it is preferrable to /not/
> > have this as a host tunable, but only as XML.  You generally don't
> > want anything affecting mig compatibility in host level configs.
> 
> Thanks for the reminder. Yes, grant frame value could have an affect on
> migration. I didn't put much thought into it since Xen has a similar concept
> in their host level config. Difference is, they also support the setting in
> their per-domain config.
> 
> So I'm back to figuring out how to model this in XML
> 
> https://www.redhat.com/archives/libvir-list/2019-February/msg01218.html
> 
> Your opinion would be much appreciated! Thus far my preferred option is the
> last one described in that thread
> 
> https://www.redhat.com/archives/libvir-list/2019-March/msg00124.html

Yes, I concur with that preference,

Regards,
Daniel
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