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 Regards, Jim