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I did do some package updates when I moved to the newer kernel. Its worth me testing to go back to 5.13.x and see how it runs. I was able to get it to do a little better by bumping the following settings. KSM_NPAGES_BOOST=500000000 KSM_NPAGES_MIN=2000000000 KSM_NPAGES_MAX=3000000000 I...

Here is the system were ksm is broken. root@ccscloud4:~# for i in /sys/kernel/mm/ksm/*; do echo "$i:"; cat $i; done /sys/kernel/mm/ksm/full_scans: 7635 /sys/kernel/mm/ksm/max_page_sharing: 256 /sys/kernel/mm/ksm/merge_across_nodes: 1 /sys/kernel/mm/ksm/pages_shared: 447156...

Got it. root@ccscloud4:~# pveversion -v proxmox-ve: 7.4-1 (running kernel: 6.2.16-4-bpo11-pve) pve-manager: 7.4-16 (running version: 7.4-16/0f39f621) pve-kernel-6.2: 7.4-4 pve-kernel-5.15: 7.4-4 pve-kernel-5.13: 7.1-9 pve-kernel-6.2.16-4-bpo11-pve: 6.2.16-4~bpo11+1 pve-kernel-6.2.11-2-pve...

On the latest packages and kernel. root@ccscloud4:~# pveversion pve-manager/7.4-16/0f39f621 (running kernel: 6.2.16-4-bpo11-pve) ksmtuned.conf was adjusted for when it kicks in (KSM_THRES_COEF=50) other than that its pretty basic. root@ccscloud4:~# pveversion pve-manager/7.4-16/0f39f621...

We have been on the 5.13.x kernel because the entire 5.15 kernel is a mess imo. Live migration being a #1. I can't do any testing on 5.15.x for that reason.

Yea these are CentOS7 guests that serve up extremely active app's. Probably a bit more active than any windows guest.

Started testing with it earlier, but still need to let things run for a bit. So far its not looking much different.

KSM sharing is pretty much broken in the 6.2.x kernel and pve8. Leaving this here for more attention. https://forum.proxmox.com/threads/ksm-memory-sharing-not-working-as-expected-on-6-2-x-kernel.131082/

Also worth mentioning I am having performance issues on the 6.2.x kernels without ksm enabled. We have pretty much lost 20-30% performance in the 6.2.x kernel's. These are heavy lifting CentOS7 LAMP servers that have no issues on the 5.13 and 5.15 kernel (Besides live migration on the 5.15.x...

Yikes, 5.15 kernel is a mess to. Live migration between different CPU's and identical CPU's is pretty much broken all together. Looks like we are going back to thee 5.13 kernel as nothing has been stable in 6-12 months.

Hey all. I have a 7 node cluster with roughly 600 CentOS7 VM's running on it. Typically average anywere from 150-500G in KSM memory sharing. After moving to the 6.2.x kernel on 2 of the 7 front ends those 2 front ends are barely using any KSM sharing. Front end with 6.2.x Front end with...

Got it! Appreciate the info!

Was there something going on with the 6.2.11-2-pve kernel?

Just wanted to get some input on the latest 6.2.x kernel that was just released. What does bpo11 mean exactly? Linux 6.2.16-4-bpo11-pve

Can confirm moving the disk to a node that hasn't been updated did the job.

No atm some are on newer version as we are having performance and live migration issues between kernels.

Getting this trying to move a disk. Moving disks from Ceph to LVM iscsi storage. What I don't understand is all the disks on the LVM iscsi storage that are in place now are using aio=io_uring by default. So if aio=io_uring is bad for this disk type, then why is it default when creating a...

That was enough to get me on the right track. This did the job. pvscan --cache

I have some iscsi based storage with LVM ontop. Introduced a new lun this morning to all 7 nodes. On one of the hosts I created a physical volume and volume group on mpath6. Iscsi looks good and so does multipath on all the hosts. Each host has the following. mpath6...

Maxvz 0 was a great idea. Then I simply add the pve VG as LVM storage and we are in business.