What CPU should I select for best VM performance

[danny2576]

I have a HP z620 machine with one Xeon E5 2697 v2 CPU
If I choose IvyBridge CPU, the Windows VM reports Xeon E3-12xx v2 (Ivy Bridge CPU)

Is it OK to leave it like this ?

Also what does IvyBridge-IBRS CPU mean ?

 

[dignus]

“Host” is always best.

 

[_gabriel]

for this old CPU, I disable mitigations (set kernel mitigations=off)

 

[danny2576]

for this old CPU, I disable mitigations (set kernel mitigations=off)

Where should I enter that option ?
Obviously I am new to Proxmox.

 

[_gabriel]

G

Post in thread 'Ubuntu 20 VM Much slower than in ESXi'

Jun 24, 2024

https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_edit_kernel_cmdline

= For GRUB boot loader (often used) :
nano /etc/default/grub
Edit Line to GRUB_CMDLINE_LINUX_DEFAULT="mitigations=off"
upgrade-grub
reboot required to apply

(there is another file to edit if boot loader is SystemD-Boot , used if ZFS + EFI Secure Boot Off )

• _gabriel

 

[somebodyoverthere]

the short answer: it depends. The best way is to test and retest

https://www.reddit.com/r/Proxmox/comments/1j2zrol/the_reasons_for_poor_performance_of_windows_when/