Package: zfs-dkms Version: 0.8.3-1 Severity: normal This is actually for zfs-dkms 0.8.2-3~bpo10+1 from buster-backports, but I am filling this bug on another computer running sid.
During zfs-dkms post-install, it build modules for all installed kernels, I did notice it is very slow, and looking at the top, it looks to be using just a single core during a build process. Manually building zfs from source with make -j8 was significantly faster. The machine I was doing this on has 8 cores (AMD FX-8320). On more modern machines (like Ryzen 3950, or 2950X, difference could be more dramatic). I have no idea if this is the issue with zfs-dkms or dkms in general, but compiling using single process only isn't the best idea. Use all (or half maybe?) available cores if possible, and limit the impact to the rest of the system using schedtool or nice. The apt install / dpkg itself will impact the CPU usage anyway, so it is totally expected for the CPU usage to be high during this process. So I see no reason to not use all available core and speed up the install / upgrade. Cheers, Witold -- System Information: Debian Release: bullseye/sid APT prefers testing-debug APT policy: (500, 'testing-debug'), (500, 'unstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.2.0-3-amd64 (SMP w/32 CPU cores) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages zfs-dkms depends on: ii debconf [debconf-2.0] 1.5.73 ii dkms 2.8.1-5 ii file 1:5.38-4 ii libc6-dev [libc-dev] 2.29-10 ii libpython3-stdlib 3.7.5-3 ii lsb-release 11.1.0 ii perl 5.30.0-9 ii python3-distutils 3.8.0-1 Versions of packages zfs-dkms recommends: ii linux-libc-dev 5.4.13-1 ii zfs-zed 0.8.3-1 ii zfsutils-linux 0.8.3-1 Versions of packages zfs-dkms suggests: pn debhelper <none> -- debconf information excluded
