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Hi Jan,
I had some time to re-test this.
I tried live migration with KVM64 CPU between 2 nodes:
node-ryzen1700 - kernel 5.19.7-1-pve
node-ryzen5900x - kernel 5.19.7-1-pve
I bulk-migrated 9 VMs (8 Debian 9/10/11 and 1 Windows 2008r2).
This works OK in both directions.
Then I downgraded a node to 5.13:
node-ryzen1700 - kernel 5.19.7-1-pve
node-ryzen5900x - kernel 5.13.19-6-pve
Migration of those 9 VMs worked well from node-ryzen1700 -> node->ryzen5900x
But migration of those 9 VMs back node->ryzen5900x -> node-ryzen1700 was
a disaster: all 8 debian VMs hung with 50/100% CPU use. Window 2008r2
seems not affected by the issue at all.
3 other Debian/Windows VMs on node-ryzen1700 were not affected.
After migrating both nodes to kernel 5.13:
node-ryzen1700 - kernel 5.13.19-6-pve
node-ryzen5900x - kernel 5.13.19-6-pve
Migration of those 9 VMs node->ryzen5900x -> node-ryzen1700 works as
intended :)
Cheers
El 8/11/22 a las 9:40, Eneko Lacunza via pve-user escribió:
Hi Jan,
Yes, there's no issue if CPUs are the same.
VMs hang when CPUs are of different enough generation, even being of
the same brand and using KVM64 vCPU.
El 7/11/22 a las 22:59, Jan Vlach escribió:
Hi,
For what’s it worth, live VM migration with Linux VMs with various
debian versions work here just fine. I’m using virtio for networking
and virtio scsi for disks. (The only version where I had problems was
debian6 where the kernel does not support virtio scsi and megaraid
sas 8708EM2 needs to be used. I get kernel panic in mpt_sas on thaw
after migration.)
We're running 5.15.60-1-pve on three node cluster with AMD EPYC 7551P
32-Core Processor. These are supermicros with latest bios (latest
microcode?) and BMC
Storage is local ZFS pool, backed by SSDS in striped mirrors (4
devices on each node). Migration has dedicated 2x 10GigE LACP and
dedicated VLAN on switch stack.
I have more nodes with EPYC3/Milan on the way, so I’ll test those
later as well.
What does your cluster look hardware-wise? What are the problems you
experienced with VM migratio on 5.13->5.19?
Thanks,
JV
Eneko Lacunza
Zuzendari teknikoa | Director técnico
Binovo IT Human Project
Tel. +34 943 569 206 |https://www.binovo.es
Astigarragako Bidea, 2 - 2º izda. Oficina 10-11, 20180 Oiartzun
https://www.youtube.com/user/CANALBINOVO
https://www.linkedin.com/company/37269706/
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