Re: [pve-devel] [PATCH-SERIES v3 qemu-server/manager/common] add and set x86-64-v2 as default model for new vms and detect best cpumodel

From: Aaron Lauterer <a.lauterer@proxmox.com>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
	Fiona Ebner <f.ebner@proxmox.com>,
	Eneko Lacunza <elacunza@binovo.es>,
	"DERUMIER, Alexandre" <alexandre.derumier@groupe-cyllene.com>,
	"aderumier@odiso.com" <aderumier@odiso.com>
Subject: Re: [pve-devel] [PATCH-SERIES v3 qemu-server/manager/common] add and set x86-64-v2 as default model for new vms and detect best cpumodel
Date: Fri, 2 Jun 2023 14:41:18 +0200	[thread overview]
Message-ID: <34e130a8-e3c0-8dc7-dd72-51d22a670f4a@proxmox.com> (raw)
In-Reply-To: <5a05ae07-7002-8e3a-1e11-bd5269d58e4f@proxmox.com>

For the record, I tested on:

AMD Ryzen 9 7900X 12-Core Processor
AMD EPYC 7302P 16-Core Processor (Rome)
AMD EPYC 7313 16-Core Processor (Milan)

VMs were all with 2 or 4 cores, q35 and UEFI boot.

 >> qm set <ID> -args '-cpu 
kvm64,enforce,+kvm_pv_eoi,+kvm_pv_unhalt,+sep,+lahf_lm,+popcnt,+sse4.1,+sse4.2,+ssse3'

all VMs installed nicely without a problem

 >> qm set <ID> -args '-cpu 
Nehalem,enforce,+aes,-svm,-vmx,+kvm_pv_eoi,+kvm_pv_unhalt,vendor="GenuineIntel"'

VMs got stuck during the Debian installer at some point, some were able to 
switch to another TTY, but I don't think that is deterministic.

On the Ryzen 7900X machine, I even saw a crash and kernel trace once when 
starting the installer. It didn't show up again after a reset and cold boot of 
the VM :-/

On 6/1/23 18:00, Fiona Ebner wrote:
> Am 01.06.23 um 14:02 schrieb Eneko Lacunza:
>> Hi,
>>
>> We have Ryzen 1700, 2600X, 3700 and 5950X machines here, I can test on
>> them if that helps (please detail tests to perform).
>>
>> Thanks
>>
> 
> Hi,
> thank you for the offer. It would be interesting to see if you have any
> issues with the following:
> 
>> qm set <ID> -args '-cpu kvm64,enforce,+kvm_pv_eoi,+kvm_pv_unhalt,+sep,+lahf_lm,+popcnt,+sse4.1,+sse4.2,+ssse3'
> 
> If you like you can also test
> 
>> qm set <ID> -args '-cpu Nehalem,enforce,+aes,-svm,-vmx,+kvm_pv_eoi,+kvm_pv_unhalt,vendor="GenuineIntel"'
> 
> After testing use
> 
>> qm set <ID> --delete args
> 
> to get rid of the modification again.
> 
> Make sure to stop/start the VM fresh after each modification.
> 
> As for what to test, installing Debian 11 would be nice just for
> comparison, but other than that, just do what you like, shouldn't really
> matter too much :)
> 
> Best Regards,
> Fiona
> 
> 
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