[PVE-User] Hardcoded startup RAM for QEMU memory hotplug

[Jan Pechek]

Hi,
Looking at the code, it's 1024MB * the number of sockets, so adding sockets
might be workaround. Thanks for the idea. Another workaround might be to
simply disable memory hotplug before leapp.
The kernel option "memhp_default_state=online" also works. However, I think
the ability to configure the startup RAM size in Proxmox would be nice.

On Thu, Jan 8, 2026 at 4:21 PM DERUMIER, Alexandre <
alexandre.derumier at groupe-cyllene.com> wrote:

> hi currently no, but it's related to the number of cpu sockets of the
> vm. (it's 512mb by socket if I remember correctly).
>
> so, you can try a vm with 4 sockets.
>
>
> you can also add "memhp_default_state=online" to kernel boot option, it
> should auto enable the hotplug memory dimm when kernel boot
>
>
> -------- Message initial --------
> De: Jan Pechek via pve-user <pve-user at lists.proxmox.com>
> Répondre à: Proxmox VE user list <pve-user at lists.proxmox.com>
> À: pve-user at lists.proxmox.com
> Cc: Jan Pechek <jan.pechek at daktela.com>
> Objet: [PVE-User] Hardcoded startup RAM for QEMU memory hotplug
> Date: 08/01/2026 14:43:34
>
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