[pve-devel] qemu memory hotplug limited to 64 dimm

[Dietmar Maurer]

Can't we simply increase that max_mem_regions default value?


> On December 12, 2016 at 4:54 PM Alexandre DERUMIER <aderumier at odiso.com>
> wrote:
> 
> 
> vhost 64 limit has been introduced here, because of qemu crash with bigger
> value
> 
> https://patchwork.kernel.org/patch/6709021/
> 
> ----- Mail original -----
> De: "aderumier" <aderumier at odiso.com>
> À: "pve-devel" <pve-devel at pve.proxmox.com>
> Envoyé: Lundi 12 Décembre 2016 16:51:11
> Objet: [pve-devel] qemu memory hotplug limited to 64 dimm
> 
> Hi, 
> 
> a proxmox user has reported problem to hotplug memory with high values (48G) 
> 
> https://forum.proxmox.com/threads/apt-get-upgrade-to-update-proxmox-server.30992/
> 
> 
> 
> Seem that qemu check about a vhost value 
> 
> https://lists.nongnu.org/archive/html/qemu-devel/2015-07/msg05998.html 
> 
> cat /sys/module/vhost/parameters/max_mem_regions > 64 (verified on my
> servers). 
> 
> 
> I think this limit was not present when we have implemented hotplug. 
> 
> Not sure was we can do, but I think our method don't scale anymore :( 
> 
> Maybe should we introduce a new fixed "dimm size" option, to allow hotplug of
> more memory ? 
> 
> 
> 
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