Comment 28 for bug 1668129

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Dan Streetman (ddstreet) wrote :

>> FYI: RHEL 7.3 does not suffer from this problem and appears to have ballooning enabled:
> I imagine CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is set for the Ubuntu kernel?

yes exactly, CONFIG_XEN_BALLOON_MEMORY_HOTPLUG must be enabled for it to actually increase the physical memory region, which is what the problem is in this case.