problem with hotplug and 64GB ram

[pschonmann]

Still have issues
pve-manager/8.0.4/d258a813cfa6b390 (running kernel: 6.2.16-19-pve)

Testing vps config

agent: 1
boot: order=ide2
cores: 128
cpu: x86-64-v2-AES
hotplug: disk,network,usb,memory,cpu
ide2: none,media=cdrom
memory: 61440
meta: creation-qemu=8.0.2,ctime=1698709821
name: bla
numa: 1
ostype: l26
scsihw: virtio-scsi-single
smbios1: uuid=c655e14f-d994-411e-81ca-f7d55284060c
sockets: 1
vcpus: 4
vmgenid: 05e14755-9070-432e-8883-410032859a27

 

[are]

Did you set max_mem_regions as described earlier?

 

[pschonmann]

Did you set max_mem_regions as described earlier?

YES

root@proxmox1:~# cat /etc/modprobe.d/modprobe.conf
options vhost max_mem_regions=128

 

[are]

I assume that you also tested if it gets correctly applied (via cat /sys/module/vhost/parameters/max_mem_regions) and if values like 512 work...

 

[pschonmann]

Yes, i tried

echo "options vhost max_mem_regions=512" > /etc/modprobe.d/vhost.conf
rmmod vhost_net
rmmod vhost
modprobe vhost_net
cat /sys/module/vhost/parameters/max_mem_regions
# 512

 

[thaf]

Same issue on proxmox 7.4-17, but at least everything works if you're generous and add an extra GB.

 

[pschonmann]

Same issue on proxmox 7.4-17, but at least everything works if you're generous and add an extra GB.

Did you fixed it when you added 1024MiB to actual setup ? for example 64GiB => 65GiB ?

 

[thaf]

Did you fixed it when you added 1024MiB to actual setup ? for example 64GiB => 65GiB ?

Yes, I went with 66560 instead of 65536 in the VM definition and that fixed it. It is a silly bug.

 

[pschonmann]

Yes, I went with 66560 instead of 65536 in the VM definition and that fixed it. It is a silly bug.

This is nasty and really works

 

[xoma11]

TASK ERROR: memory size (81920) must be aligned to 2048 for hotplugging
pve-manager/8.1.3

 

[Maksimus]

TASK ERROR: memory size (81920) must be aligned to 2048 for hotplugging
pve-manager/8.1.3

Add another 1GB of memory. It helped me, it was 64, I set it to 65 and everything worked.

 

[Nemesiz]

Old thread but I have the same problem.

If I set ram as hotplug and size 122880: TASK ERROR: memory size (122880) must be aligned to 4096 for hotplugging
If I change to 123904: Kernel panic - not syncing: System is deadlocked on memory

If I remove ram from hotplug and set the size 122880: everything is ok.

# pveversion -v
proxmox-ve: 8.1.0 (running kernel: 6.2.16-18-pve)
pve-manager: 8.1.3 (running version: 8.1.3/b46aac3b42da5d15)
proxmox-kernel-helper: 8.1.0
pve-kernel-6.2: 8.0.5
proxmox-kernel-6.5: 6.5.3-1
proxmox-kernel-6.5.3-1-pve: 6.5.3-1
proxmox-kernel-6.2.16-20-pve: 6.2.16-20
proxmox-kernel-6.2: 6.2.16-20
proxmox-kernel-6.2.16-18-pve: 6.2.16-18
ceph-fuse: 17.2.6-pve1+3
corosync: 3.1.7-pve3
criu: 3.17.1-2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx8
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-4
libknet1: 1.28-pve1
libproxmox-acme-perl: 1.5.0
libproxmox-backup-qemu0: 1.4.1
libproxmox-rs-perl: 0.3.3
libpve-access-control: 8.0.7
libpve-apiclient-perl: 3.3.1
libpve-common-perl: 8.1.0
libpve-guest-common-perl: 5.0.6
libpve-http-server-perl: 5.0.5
libpve-rs-perl: 0.8.7
libpve-storage-perl: 8.0.5
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 5.0.2-4
lxcfs: 5.0.3-pve4
novnc-pve: 1.4.0-3
proxmox-backup-client: 3.1.2-1
proxmox-backup-file-restore: 3.1.2-1
proxmox-kernel-helper: 8.1.0
proxmox-mail-forward: 0.2.2
proxmox-mini-journalreader: 1.4.0
proxmox-widget-toolkit: 4.1.3
pve-cluster: 8.0.5
pve-container: 5.0.8
pve-docs: 8.1.3
pve-edk2-firmware: 4.2023.08-2
pve-firewall: 5.0.3
pve-firmware: 3.9-1
pve-ha-manager: 4.0.3
pve-i18n: 3.1.5
pve-qemu-kvm: 8.1.2-6
pve-xtermjs: 5.3.0-3
qemu-server: 8.0.10
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.8.0+pve1
vncterm: 1.8.0
zfsutils-linux: 2.2.2-pve1

 

[ptsbkhairul]

Old thread but I have the same problem.

If I set ram as hotplug and size 122880: TASK ERROR: memory size (122880) must be aligned to 4096 for hotplugging
If I change to 123904: Kernel panic - not syncing: System is deadlocked on memory

If I remove ram from hotplug and set the size 122880: everything is ok.

Hi,

Same situation, do we have workaround to achieve memory hotplug + 64 GB RAM VM. Already try +1 (65 GB) but still hit error

 

[dpearceFL]

Getting almost the same error message on Proxmox 8.1.4:

memory size (65536) must be aligned to 2048 for hotplugging

 

[dpearceFL]

Turning off memory hotplug is a work around. Still happening in Proxmox 8.1.4.

 

[emptness]

Hello everyone!
Proxmox VE 8.2-4 error remains.
Disabling hotplug helps.
These settings
cat /etc/modprobe.d/modprobe.conf
options vhost max_mem_regions=512
help if you add another 1024 MB to the desired RAM value.

I have another question.
I need to increase the RAM to 1024 GB. Can I set the parameter to options vhost max_mem_regions=1512, for example?
Can there be any problems with the cluster or with VM performance because of this?

 

[spirit]

Hello everyone!
Proxmox VE 8.2-4 error remains.
Disabling hotplug helps.
These settings
cat /etc/modprobe.d/modprobe.conf
options vhost max_mem_regions=512
help if you add another 1024 MB to the desired RAM value.

I have another question.
I need to increase the RAM to 1024 GB. Can I set the parameter to options vhost max_mem_regions=1512, for example?
Can there be any problems with the cluster or with VM performance because of this?

512 regions is enough to reach 4TB emmory. (this is the number of memory slots inside qemu)