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    Alternative to memory ballooning

    Scheduled Pinned Locked Moved Development
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    • ForzaF Offline
      Forza
      last edited by Forza

      Memory ballooning is a good thing, but can lead to issues, especially during migration. Since Citrix seems to have abandoned the technology, I am happy Xcp-ng keeps it.

      In QEMU/KVM/VirtIO world there is a new thing as an alternative to ballooning, which is memory hot plug. https://virtio-mem.gitlab.io/

      The basic idea is to emulate memory modules and utilise OS support for memory hot plug, something that has been used on bare metal servers before.

      Could this be a avenue to develop with xcp-ng to overcome the limitations of the traditional ballooning?

      One clear benefit is to be able to add more memory than originally allocated a guest without restarting the guest.

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      • olivierlambertO Offline
        olivierlambert Vates 🪐 Co-Founder CEO
        last edited by olivierlambert

        No sure this will be compatible with the level of memory isolation provided in Xen (vs the more "open bar" model in KVM). Worth taking a look though, thanks for the link.

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