[PVE-User] Unexpected behaviour at pmxcfs pve5.0 + pve5.2

[Dewangga Alam]

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Hello!

Currently I have mixed cluster pve5.0 and pve5.2, total nodes is 17, 6
nodes using pve5.0 and the rest is pve5.2.

The issue was addressed to pmxcfs, really slow when I test using
`touch a`, the result was :

root at pve50:/etc/pve# time touch a

real	0m13.099s
user	0m0.000s
sys	0m0.000s

root at pve52:/etc/pve# time touch b

real	0m14.216s
user	0m0.001s
sys	0m0.000s

I ran debug logs by invoking `echo "1" >/etc/pve/.debug` command and I
got this.

https://paste.fedoraproject.org/paste/F-OW-VVNdL3ZZ8iv6SzNsA/raw

I didn't found any strange behavior, but, somehow the pmxcfs really
slow. Any helps are appreciated. :)

Regards,
Dewangga
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