[ ... ] > > Hi Jens, > > > > I have pulled linux-block.git#async-buffered.5 on top of Linux v5.7-rc7. > > > > From first feelings: > > The booting into the system (until sddm display-login-manager) took a > > bit longer. > > The same after login and booting into KDE/Plasma. > > There is no difference for "regular" use cases, only io_uring with > buffered reads will behave differently. So I don't think you have longer > boot times due to this. > Yupp, you are right. The previous Linux v5.7-rc7 without your patchset shows the same symptoms. I did some debugging and optimizing with systemd-analyze boot and time. I optimized systemd-journald.service and systemd-journal-flush.service... # cat /etc/systemd/journald.conf.d/00-journal-size.conf [Journal] SystemMaxUse=50M ...and reduced the time spent flushing systemd's journal from ~30s down to 1,6s... # journalctl -b --unit systemd-journald.service -- Logs begin at Fri 2020-05-29 00:58:37 CEST, end at Fri 2020-05-29 11:42:18 CEST. -- Mai 29 11:34:52 iniza systemd-journald[281]: Journal started Mai 29 11:34:52 iniza systemd-journald[281]: Runtime Journal (/run/log/journal/566abbcb226b405db834b17a26fe4727) is 8.0M, max 78.5M, 70.5M free. Mai 29 11:34:53 iniza systemd-journald[281]: Time spent on flushing to /var/log/journal/566abbcb226b405db834b17a26fe4727 is 1.656233s for 765 entries. Mai 29 11:34:53 iniza systemd-journald[281]: System Journal (/var/log/journal/566abbcb226b405db834b17a26fe4727) is 56.2M, max 50.0M, 0B free. Unfortunately, I upgraded some user-space stuff like udisks2 and libblockdev packages. Downgrading did not help and disabling the systemd-unit also. As I saw stallings with e2scrub_reap.service and swap partition (partly seen in the boot-process and noted the UUID 3f8e). I disabled e2scrub_reap.service and deactivated swap partition in /etc/fstab. Doing all above together did not help. Finally, I checked the health of the HDD where my root-fs is. smartmontools says everything is OK. I have not checked the status of the Ext4-FS where my root-fs is. Such things I do with a linux-live-system - as a Debianist I admit I use an ArchLinux ISO on USB-stick :-). Unsure, if I will contact the systemd (and mabye udisks) Debian folks to hear their opinion. Thanks Jens and your patchset. I don't know when I last run systemd-analyze & stuff and investigated so deeply :-). A lot of Hygge (I love to write wrong Huegge - see English hugs) to you Jens. - Sedat - [1] http://ftp.halifax.rwth-aachen.de/archlinux/iso/
