mv is massively slower on the host rather than in a nspawn chroot, regression somewhere?

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Hi,

So I have an annoying bug that started near the beginnings of F35.
My papirus-icon-theme became very slow to install:
https://bugzilla.redhat.com/show_bug.cgi?id=2029709#c18

During the installation, all the files are copied, then renamed by rpm (no idea why it works like this).

It works fast in a Mock chroot but incredibly slow on bare metal.

I've done a small test of moving files:

[root@cassini icons]# mkdir test
[root@cassini icons]# for (( i = 0; i < 10000; i++ )) do > test/file_$i; done
[root@cassini icons]# cd test

On host:

time $(for f in *; do     mv "$f" "${f%}.txt"; done)
real    2m3,500s
user    0m3,966s
sys     2m0,431s

In nspawn container:

<mock-chroot> sh-5.1# time $(for f in *; do     mv "$f" "${f%}.txt"; done)
real    0m6.702s
user    0m4.237s
sys     0m3.344s

Since papirus-icon-theme contains more than 100,000 (small) files, it is a problem. One minute of waiting is ok, 20 mn is not.

What can cause this? I read that nspawn virtualizes the file system, could it be file system related on the host? (I use btrfs btw)

Any input welcome!

Best regards,

Robert-André
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