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    Proxmox 8.0 / Kernel 6.2.x 100%CPU issue with Windows Server 2019 VMs

    Will do my best as soon as I get a chance and report back
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    Proxmox 8.0 / Kernel 6.2.x 100%CPU issue with Windows Server 2019 VMs

    @fweber I've manage to dedicate 1 node with mitigations=on and single client RDS server (who is working free of charge and should not complaint to much) So, I'm ready to test new kernel with patch if you provide such Right now numa balancing has been switched off and RDS server works smoothly...
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    Proxmox 8.0 / Kernel 6.2.x 100%CPU issue with Windows Server 2019 VMs

    Thanks a lot! Just some highlights that drove me crazy if disabling numa balancing is completely legitimate solution shouldn't it be disabled by default?
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    Disable fs-freeze on snapshot backups

    Then check this thread and links to virtio driver git (there are some advices from devs) If you are able to reproduce this issue easily it would be very helpful to find a solution or workaround
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    Disable fs-freeze on snapshot backups

    @roms2000 have you checked syslog after reboot? Is there anything related to ID 129 in windows syslog?
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    I performed some tests on my cluster and can confirm that tuning vzdump.conf could be used as workaround max average throughput of my 5 nodes cluster (with CEPH) = ~800MiB/s and PBS storage = ~300MiB/s 1) I set vzdump.conf as following: bwlimit: 150000 ionice: 8 2) On PBS I limited input...
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    However with ionice=8 set in vzdump.conf I can see it in backup log INFO: starting new backup job: vzdump --exclude 101,100,103 --notes-template '{{guestname}}' --storage PBS --mode snapshot --mailto ... --all 1 --mailnotification failure --node 063-pve-04446 INFO: Starting Backup of VM 6302...
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    PVE and virtio devs are already aware of this problem and I hope they will find out what goes wrong and fix it asap
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    What do mean by "such high values"? Defaults are: 2Mb with 60s timeout, tuned: 256Kb with 90s timeout You are free to test just one of them anyway
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    I will try the following: tune virtio-scsi driver settings via windows registry set ionice=8 in vzdump.conf on all nodes in cluster
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    Have you tried tuning virtio-scsi parameters as advised by virtio devs? HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vioscsi\Parameters\Device IoTimeoutValue = 0x5a (90) HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vioscsi\Parameters\Device PhysicalBreaks = 0x3f (63)
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    1) It died silently. It was not even possible to log in via console (it was no freezed but there were no services avalible) 2) Let me make it clear. PBS respects bwlimit parameter in vdump.conf? In other words: if I set bwlimit in vdump.conf PBS client will limit backup speed? Am I correct...
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    @fiona Is there any way to limit read/write bandwidth of PBS client (something like bwlimit in vdump.conf) ? there is a suggestion from virtio devs: How should I change my Vm config to incorporate this tune? P.S. there is another thread...
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    How to do that? (reduce number of concurrent backups) ? In my cluster there is only 1 backup job and if I'm not mistaken PVE sterilize backups from all nodes within cluster) P.S. right, Vm hangs after backup (when another backup in progress). Win and Linux vm affected
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    Not in my case. 40Gbe link. There is powerful CPU and HW RAID with SSD disks on PBS server CEPH datastore performance is a key limited factor (of backup speed) And one more thing: VM "hangs" (with different event to windows syslog + ID 129 as well) when another VM is backing up (that VM is...
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    Redhat VirtIO developers would like to coordinate with Proxmox devs re: "[vioscsi] Reset to device ... system unresponsive"

    Thanks for the link! I found this event ( ID 129 ) on one of my Windows VM that randomly hangs right after (during?) backup to PBS Hope that PVE devs will take a look at this issue
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    Proxmox 8.0 / Kernel 6.2.x 100%CPU issue with Windows Server 2019 VMs

    Well, I’m pretty confident that this issue is not directly related to guest OS. In my case I have not seen such issue on PVE 7.x with kernels < 6.x However disabling numa balancing do a trick (I’m not sure with what impact on performance) If you do have an option to try the latest advice from...
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    Proxmox 8.0 / Kernel 6.2.x 100%CPU issue with Windows Server 2019 VMs

    Thank for sharing. I will give it a try. However I’m afraid this isn’t a key to the topic problem - I’m facing this issue even on hosts with only single VM (1 vm per host) and KSM disabled (it useless on such setup)

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