chrismurphy added a new comment to an issue you are following:
``
I posted sizes for various mksquashfs outputs in #8581, relevant to this issue is dropping
the nested ext4 image reduces the size of the image by about 3%. And it also drops the
consumer side /dev/loop1 CPU hit by 1/3; with this change it's necessary to profile
/dev/loop0 (there is no loop1), and it never goes above 10% CPU. Details in:
https://bugzilla.redhat.com/show_bug.cgi?id=1717728#c25
I can confirm inserting this plain squashfs.img into the ISO startsup without any changes,
automatically using overlayfs. And once the following change appears in Fedora, which I
just tested, Anaconda will also understand it.
https://github.com/rhinstaller/anaconda/pull/2070/files
The gotcha right now, is even with level 22 selected, block size 256K, and plain squashfs
image, the resulting squashfs.img is ~5% bigger than the current squashfs.img method. I
think I know why, and have filed a bug here:
https://bugzilla.redhat.com/show_bug.cgi?id=1743029
NOTE: That means all "level 22" sizes mentioned before 20190818 might actually
be level 19.
``
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https://pagure.io/releng/issue/8646