I have looked into it a bit. I have noticed that some functions were not inlined in 5.15, but were inlined in 5.4. For example `lzma_literal` and `lzma_match` (see difference in System.map). After removing `CONFIG_DEBUG_SECTION_MISMATCH=y` from `debian/rules.d/0-common-vars.mk` (I am not sure why it is there, maybe a left over for some debugging), I got those functions to be inlined in 5.15. However while there is some measurable speed gain, it is very small, and it seems to be a only small fraction of the issue.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1975688 Title: Accessing squashfs with lzma compression is ~16% slower in 5.15 when compared to 5.4, on an RPi3 B+ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1975688/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
