Hello everybody; I'd like to publicize the following bug that I reported for opensuse: [kernel 5.15][btrfs compression property] zypper taking too long to install one package https://bugzilla.opensuse.org/show_bug.cgi?id=1193549 I got support from the btrfs developer Filipe Manana and the issue is well understood regarding this file system but, since the root cause wasn't found, maybe it is of interest for the VFS kernel subsystems. TL;DR: comment #46 Filipe Manana 2022-01-05 10:54:16 UTC (In reply to Bruno Damasceno Freire from comment #45) > k5.14.14-3 : @inode_evictions: 1715 > k5.15.12-1 : @inode_evictions: 166106 > k5.16~rc8 : @inode_evictions: 1715 That confirms the hypothesis. Somehow a 5.15 is triggering ~100x inode evictions, which will result in renames doing unnecessary inode logging. As to why that is happening, I have no idea if anything in mm or vfs changed in some 5.15 release that results in triggering a lot more evictions. To reproduce: I am an opensuse user, so I'm not sure on how to reproduce the issue on other distros. Here are some updated instructions to reproduce it on tumbleweed: SETUP-------------------------------------------- 1 get the installation image wget http://download.opensuse.org/tumbleweed/iso/openSUSE-Tumbleweed-NET-x86_64-Current.iso 2 create a basic VM 11GB storage shold be enought for the tumbleweed installer 3 install a server or a desktop version with btrfs no btrfs snapshots needed 4 downgrade the kernel if its > 5.15 (should be available for the next 3 weeks) wget http://download.opensuse.org/history/20220106/tumbleweed/repo/oss/x86_64/kernel-default-5.15.12-1.2.x86_64.rpm zypper in --force kernel-default-5.15.12-1.2.x86_64.rpm boot the 5.15 kernel 5 get the affected package: libKF5Emoticons5 (4 minutes), gutenprint (32 minutes)... env LANGUAGE=eng zypper info libKF5Emoticons5 | grep Version wget http://download.opensuse.org/tumbleweed/repo/oss/x86_64/libKF5Emoticons5-(version).x86_64.rpm TEST--------------------------------------------- 6 install the package: it should take a few seconds rpm --force -U -nodeps ./libKF5Emoticons5-(version).x86_64.rpm 7 enable any compression (zlib, lzo, zstd) on the package's destination folder with most files optional: rpm -ql libKF5Emoticons5 | less btrfs property set /usr/share/emoticons/EmojiOne compression zstd:1 8 retry to install: it should take much longer now !!! <<<<< rpm --force -U -nodeps ./libKF5Emoticons5-(version).x86_64.rpm 9 disable compression btrfs property set /usr/share/emoticons/EmojiOne compression "" 10 retry to install: it should take a few secons again rpm --force -U -nodeps ./libKF5Emoticons5-(version).x86_64.rpm Alternatively: 1 get an installation image with a 5.15 kernel http://opensuse.zq1.de/history/20220106/tumbleweed/iso/openSUSE-Tumbleweed-DVD-x86_64-Snapshot20220106-Media.iso 3 install a server or a desktop version with btrfs no btrfs snapshots needed To get the files (and the 5.15 kernel) from the image you: a) should not activate repositories or b) should not enable network TIA, Bruno
