[pve-devel] some finding avout minimum static memory when pc-dimm exists

Alexandre DERUMIER aderumier at odiso.com
Sun Jan 25 18:44:03 CET 2015


>>Not sure if we really need 2TB with hotplug? I mean, if someone really starts 
>>a VM with 2TB memory, he can also use fixed assigment for that. Most VMs will 
>>use less than 2TB ;-) 



(With my last patch, I fix the static memory to 512MB(or 1GB) if you want,
so all upper memory is dimm devices.

Note that 4TB is the physical limit for 64bits system. (and for qemu)

we can reach 4TB with a minimum dimm size of 512MB.

my $dimm_size = 512;
for (my $j = 0; $j < 8; $j++) {
    for (my $i = 0; $i < 32; $i++) {

That's seem ok for me. (I personnaly don't need to hotplug under 512MB )


----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "aderumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Dimanche 25 Janvier 2015 17:31:30
Objet: Re: [pve-devel] some finding avout minimum static memory when pc-dimm exists

> >>I don't like to have that 'maxmemory' restriction. If hotplug is enabled, I 
> >>want 
> >>to be able to 
> >>add unlimited amount of memory? 
> Yes. (I don't have check qemu code limit, but maxmemory=2TB is working) 

Not sure if we really need 2TB with hotplug? I mean, if someone really starts 
a VM with 2TB memory, he can also use fixed assigment for that. Most VMs will 
use less than 2TB ;-) 


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