memory-leaks

maintenance.org (24315B)

---

 * Config
 ** Firefox
 *** distribution channel
 [[file:install.org::*Firefox][After installing the OS]], had opted for the [[https://support.mozilla.org/en-US/kb/install-firefox-linux#w_system-firefox-installation-for-advanced-users]["install Mozilla build
 systemwide"]] method.  That works, though I'm starting to find Wayland's
 generic app icon grating.
 
 Nowadays,
 
 - Mozilla hosts [[https://support.mozilla.org/en-US/kb/install-firefox-linux#w_install-firefox-deb-package-for-debian-based-distributions-recommended][an APT repository]],
 - Debian [[https://salsa.debian.org/extrepo-team/extrepo-data/-/merge_requests/266][includes that repository]] in the extrepo database.
 
 So the time seems ripe for switching to that?  OT1H this complicates
 upgrading to a new Debian release; OTOH reading [[https://www.debian.org/releases/trixie/release-notes/upgrading.en.html#unofficial-sources][between the lines]],
 since AFAICT Mozilla only hosts /one/ repo for all supported
 Debian-shaped distros, maybe the update will be transparent?
 
 Tentative steps to replace =/opt= installation with repo installation:
 
 1. [X] backup profile
 2. [X] ~extrepo enable mozilla~
 3. [X] (tune APT preferences to pin Mozilla repository?)
 4. [X] ~sudo apt update && sudo apt install firefox~
 5. [X] cleanup
    - [X] application desktop file
    - [X] x-www-browser etc alternative
    - [X] local bin symlink
    - [X] opt installation
 6. [X] assess state of profile; restore if necessary
    - defaulted to a new profile
    - just needed to reset old profile as default
    - removed new profile
 ** samba server
 - I want most of my music on my laptop.
 - I want to access it from my desktop.
 - I want anyone on my home network to access it too.
 - I am too lazy to remove the Windows partition from my laptop, so
   that partition sits mostly empty, eating 50% of the disk space.
 
 Therefore, the only sensible move is to run Samba on the laptop,
 serving a folder on my Linux partition with a symlink to the Windows
 partition.
 
 Chosen =/etc/smb.conf= excerpts:
 
 #+begin_src conf
 [global]
 allow insecure wide links = yes
 
 [sambo]
 comment = Files yours truly is sharing with you.
 path = /home/[…user…]/Public/smb
 browseable = yes
 read only = yes
 guest ok = yes
 wide links = yes
 #+end_src
 
 Then:
 
 #+begin_src sh
 # Mount Windows disk.
 udisksctl mount --block-device /dev/disk/by-label/OS
 # Symlink it from shared directory.
 ln -s /media/[…user…]/OS/Music ~/Public/smb/
 #+end_src
 
 On the desktop side:
 #+begin_src sh
 sudo mount.cifs //hirondell.local/sambo […somewhere…] \
      -o guest,uid=$(id -u),gid=$(id -g)
 #+end_src
 * Upgrades
 ** Bookworm
 *** Rubber…
 [[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#non-free-split][Release notes § Issues to be aware of]]
 **** Minutiae
 - ~sed s/non-free/non-free-firmware/~
 - =youtube-dl= ⇒ =yt-dlp=
 - clear =GRUB_DISABLE_OS_PROBER=
 **** System logs ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#changes-to-system-logging][ref]])
 1. ~apt-mark auto rsyslog ; apt autoremove~
 2. double-check that journalctl config saves to persistent storage
 3. finally learn ~journalctl~
 **** Reduced accessibility from GTK 3⇒4 transition ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#gnome-has-reduced-accessibility-support-for-screen-readers][ref]])
 Not a huge deal for me (though [[https://github.com/transmission/transmission/discussions/5065][other aspects]] of the transition are
 irksome), but [[https://tech.lgbt/@xogium/110507457689374019][dang]].
 **** "Externally-managed" Python installation ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#python3-pep-668][ref]])
 1. inventory & clear out stuff installed with ~pip install --user~
 2. upgrade
 3. install =pipx=
 4. reinstall
 **** VLC support for VA-API disabled ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#vlc-ffmpeg-5][ref]])
 - [[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1021601][Debian bug#1021601]] =vlc: VAAPI hardware acceleration no more available=
 - [[https://code.videolan.org/videolan/vlc/-/issues/26772][VLC#26772]] =VAAPI is disabled with ffmpeg5 on vlc-3x=
   - "we won't support full FFmpeg5 in 3.0" ([[https://code.videolan.org/videolan/vlc/-/issues/26772#note_316827][ref]])
 - [[https://code.videolan.org/videolan/vlc/-/merge_requests/1245][VLC!1245]] =[VLC3] Support FFmpeg 5.0 (except for VAAPI)=
   - "it seems that the VAAPI part is far from trivial and requires
     invasive changes (contrary to the other fixes)" ([[https://code.videolan.org/videolan/vlc/-/merge_requests/1245#note_302474][ref]])
 - user reports: [[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1021664][2022-10]], [[https://old.reddit.com/r/debian/comments/z5ectb/vlc_delaying_frames_on_a_fresh_debian_12_install/][2022-11]], [[https://old.reddit.com/r/debian/comments/119x7tr/debian_12_bookworm_no_hw_acceleration_in_vlc_h264/][2023-02]], [[https://old.reddit.com/r/debian/comments/14u38mm/video_choppy_in_vlc_but_not_totem/][2023-07]]
 
 No idea how much that will affect little =hirondell=.  If push comes
 to shove, I guess I can either
 - build VLC 4,
 - learn mpv.
 **** systemd naming for Xen network interfaces ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#xen-network][ref]])
 =eth0= changes to =enX0=.  No idea if my VPS is impacted or not; it
 does have an interface named =eth0=, and that name also shows up in
 =/etc/network/interfaces=.
 **** Known severe bugs ([[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#rc-bugs][ref]])
 - [[https://bugs.debian.org/1036041][bug#1036041]]: =upgrade-reports: Dell XPS 9550 fails to boot after
   bullseye to bookworm upgrade - grub/bios interaction bug?=
 *** … meet road
 **** ("Easy mode" rehearsal on VPS)
 ***** =/etc/cloud/cloud.cfg=
 My local version has these two lines:
 #+begin_src
 mount_default_fields: [~, ~, 'auto', 'defaults,nofail', '0', '2']
 manage_etc_hosts: true
 #+end_src
 No idea if this is OVH-specific.  No idea if I want them.  Let's trust
 "the package maintainer" 😐
 ***** =/etc/ssh/sshd_config=
 OK, note to self: *never* choose "do a 3-way merge".  Thought that
 would be something along the lines of Emacs's Ediff; instead…
 #+begin_quote
 Merging changes into the new version
 #+end_quote
 /Mind giving a couple more details on that "merge" mate?/
 
 OK,
 
 - =/usr/share/openssh/sshd_config= has the new stock config,
 - =/etc/ssh/sshd_config.ucf-old= has the /previous/ *local* config
 - ~diff -u {/usr/shared/openssh,/etc/ssh}/sshd_config~ suggests that
   the ✨magic merge✨ did TRT; the only differences are
   - stuff I remember changing in (=PermitRootLogin=,
     =PasswordAtuhentication=)
   - a spurious whitespace-only hunk on =Subsystem sftp= (the
     =/usr/share= version uses tabs; the =/etc= version ended up with a
     single space)
 ***** Removing obsolete stuff
 Erm, why does ~apt purge '~c'~ says
 #+begin_quote
 The following packages were automatically installed and are no longer required:
 […] nginx-core nginx-full […]
 #+end_quote
 
 😨
 
 #+begin_src
 $ dpkg -S $(sudo which nginx)
 nginx: /usr/sbin/nginx
 $ apt depends nginx
 […]
   Replaces: nginx-core (<< 1.22.1-6~)
   Replaces: nginx-extras (<< 1.22.1-6~)
   Replaces: nginx-light (<< 1.22.1-6~)
 #+end_src
 
 Ah.
 ****** Rsyslog
 Refuses to disappear.  The doc says ~apt-mark auto~ followed by ~apt
 autoremove~ should remove it, but that does not seem to be happening
 (~autoremove~ does not find anything to remove).  The =rsyslog=
 service is still up & running, and watches =syslog.socket= to
 re-activate itself 😕
 
 Decided to explicitly ~apt remove~ it on the advice of [[https://blog.frehi.be/2023/06/04/upgrading-from-debian-11-bullseye-to-debian-12-bookworm/][this gentleman]].
 **** non-free & non-free-firmware
 #+begin_quote
 Assuming the =non-free= component was only added to the APT
 sources-list to install firmware,
 #+end_quote
 #+begin_example
 $ apt list '?narrow(?installed, ?section(non-free))'
 Listing... Done
 doc-rfc-experimental/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-fyi-bcp/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-informational/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-misc/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-old-std/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-others/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-std-proposed/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc-std/oldstable,oldstable,now 20201128-1 all [installed,automatic]
 doc-rfc/oldstable,oldstable,now 20201128-1 all [installed]
 firmware-iwlwifi/oldstable,oldstable,now 20210315-3 all [installed]
 firmware-misc-nonfree/oldstable,oldstable,now 20210315-3 all [installed]
 gcc-10-doc/oldstable,oldstable,now 10.2.0-1 all [installed,automatic]
 gdb-doc/oldstable,oldstable,now 10.1-1 all [installed]
 make-doc/oldstable,oldstable,now 4.3-2 all [installed]
 manpages-posix-dev/oldstable,oldstable,now 2017a-2 all [installed]
 manpages-posix/oldstable,oldstable,now 2017a-2 all [installed]
 tar-doc/oldstable,oldstable,now 1.34-1 all [installed]
 #+end_example
 Will be keeping =non-free= in addition to =non-free-firmware= then 🫣
 **** Fallout
 ***** GRUB
 #+begin_src sh
 sudo sed -i \
      s/'^#GRUB_DISABLE_OS_PROBER=false'/'GRUB_DISABLE_OS_PROBER=false'/ \
     /etc/default/grub
 sudo update-grub
 #+end_src
 
 ***** PEP 668
 #+begin_src sh
 # Before upgrade: keep calm…
 pip uninstall $(pip freeze --user | cut -d= -f1)
 # After upgrade: … carry on.
 sudo apt install pipx
 pipx install yt-dlp
 #+end_src
 
 ***** VLC
 +Seems fine?  No choppiness observed on a 2k@24FPS video from yt-dlp+
 
 Is choppy as all hell on /some/ videos, not sure which kind nor why;
 could not be bothered discerning the patterns.  Learned me an mpv for
 great good.
 **** Goodies
 - The [[#random-lag][random lag I had been observing since 5.8]] seems gone 🥳
 - =libtree-sitter-dev= is new enough for Emacs; can get rid of my
   =/usr/local= version.
 ** Trixie
 *** DONE Rubber…
 [[https://www.debian.org/releases/trixie/release-notes/issues.en.html#ch-information][Release notes § Issues to be aware of]]
 **** /Vu et s'en tape/
 § 5.1 "while upgrading":
 
 - interrupted remote upgrades: got 12.12
 - arch decommissions (i386, armel, MIPS): boring amd64 here
 - SSH decommissions (=~/.pam_environment=, DSA keys): unused
 - =last*= command decommissions: unused
 - filesystem encryption churn: unused
 - RabbitMQ, MariaDB churn: unused
 - =/etc/sysctl.conf= decommission: unused
 - network interface name churn: no load-bearing script using interface
   names
 - dovecot, libvirt, samba, OpenLDAP, Bacula churn: unused
 - skip-upgrades unsupported: got 12.12
 - WirePlumber, strongSwan churn: unused
 - sg3-utils: unused
 
 § 5.[2-4]: nothing of note.
 **** DONE Prepare =debian.sources= ([[https://www.debian.org/releases/trixie/release-notes/upgrading.en.html#preparing-apt-sources-files][ref]])
 1. [X] backup =/etc/apt/sources.list=
 2. [X] create =/etc/apt/sources.list.d/debian.sources= [[https://www.debian.org/releases/trixie/release-notes/upgrading.en.html#adding-apt-internet-sources][from example]]
    - =Components: main non-free-firmware non-free contrib=
    - =Types: deb deb-src=
 
 +Alternatively, just ~sed s/bookworm/trixie/g sources.list~, upgrade,
 /then/ ~apt modernize-sources~?+
 **** =/boot= free space ([[https://www.debian.org/releases/trixie/release-notes/issues.en.html#ensure-boot-has-enough-free-space][ref]])
 No worries, got the boring mono-partition setup?
 **** DONE =/tmp= switch to tmpfs ([[https://www.debian.org/releases/trixie/release-notes/issues.en.html#the-temporary-files-directory-tmp-is-now-stored-in-a-tmpfs][ref]])
 IIUC, after the first restart, should
 1. [X] confirm syslog warnings about hidden leftover files
 2. [X] ~mount --bind / /mnt~
 3. [X] ~rm -rf /mnt/tmp/~
 4. [ ] +~umount /mnt~+ oops forgot
 5. [X] restart
 6. [X] confirm absence of syslog warnings
 **** DONE =ping= privileges ([[https://www.debian.org/releases/trixie/release-notes/issues.en.html#ping-no-longer-runs-with-elevated-privileges][ref]])
 After installation, check:
 1. [X] =linux-sysctl-defaults= installed? yes
 2. [X] =net.ipv4.ping_group_range= sane? =0 2147483647= 👌
 3. [X] ~ping perdu.com~ works? yes
 **** DONE dpkg warnings about non-empty directories ([[https://www.debian.org/releases/trixie/release-notes/issues.en.html#dpkg-warning-unable-to-delete-old-directory][ref]])
 Double-check presence and content?
 **** DONE =tzdata-legacy= split ([[https://www.debian.org/releases/trixie/release-notes/issues.en.html#timezones-split-off-into-tzdata-legacy-package][ref]])
 Install, for kitschness?
 
 Actually, the update auto-intalled it.
 *** DONE … meet road
 **** DONE Plasma forgot application shortcuts
 As noted [[https://virtualdebris.co.uk/blog/039DA73E/project-zebra-upgrade-to-debian-13-and-switching-to-wayland][elsewhere]], still visible under "Custom Shortcuts Service",
 which does nothing.  Remove the category & add back "new" shortcuts.
 ** Windows
 *** 2025-03
 For [[file:../amdahl30/killing-time.org::*SSD?][reasons]], had to dust off my Windows installation.  Asked
 update-grub to [[https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#grub-os-prober][run os-prober]], booted, did "the thing"; then, out of
 due diligence (at first; quickly replaced by morbid fascination;
 sustained by existential ennui), attempted to push Windows Update as
 far as it would go.
 
 A lightly edited set of live notes follows; starting with the original
 boot following the os-prober restoration.
 **** Boot the Ⅰst
 - "let's finish setting up your PC" ??? [fn:winup-boot1-setup]
 - installed kingston manager thingy [fn:winup-boot1-kingston]
 - waiting for updates to finish
   - waiting…
   - "2023-10 Cumulative Update" stuck at "Downloading - 5%" 🤷
     - welp, does not seem to progress anymore, and there are updates
       pending restart, so let's
 
 [fn:winup-boot1-setup] This Windows installation was, AFAIR, pretty
 well "set up" when last I booted it.  Hence my surprise at this
 greeting.
 
 [fn:winup-boot1-kingston] The [[https://www.kingston.com/en/support/technical/ssdmanager][Kingston® SSD Manager]].  My main reason
 for turning on that Windows system, to be able to upgrade the firmware
 of amdahl30's primary SSD.
 **** Boot the Ⅱnd
 - "give us a minute" FFFFFUUUUUUUU
 - "we're updating Xbox Game Bar" WAT [fn:winup-boot2-xbox]
 - "your version of windows 11 has reached end of service"
   - "click here to download a newer version of windows 11 to stay
     supported"
   - ffs
   - Windows Update not doing anything; "download now" greyed out;
     "cumulative update" dropped down to /0%/
   - 100% CPU still burning 🤷
 - update running…
   - "antimalware service executable" taking 50% CPU during the update
 
 [fn:winup-boot2-xbox] I have never owned an Xbox, nor have I ever used
 this Windows installation for anything game-related (beside
 downloading & running [[https://www.pj64-emu.com/][Project64]] that one time, to evaluate how well
 that laptop could handle N64 emulation).
 **** Boot the Ⅲrd
 - "windows 11, version 23H2"
 - hope I don't have to go through =2{4H{1,2},5H1}= 😬
 - "need more disk space" are you kidding me
   - removing my music then…[fn:winup-boot3-space]
 - "almost ready"
   - "we need to do a few more things before you can update. we'll let
     you know when we're done and what to do next"
   - wtf
 
 [fn:winup-boot3-space] I, perhaps unwisely, split my 128 GB drive into
 two roughly equal-sized chunks, one for Windows, one for Debian.  The
 former sitting unused, I had dumped something like 5–10 gigs worth of
 media onto it.
 **** Boot the Ⅳth
 - "Your computer may restart a few times"
   - YOU DON'T SAY
 - 1h later it's still at 9%
 - I think I'm going to sleep tho; which means it will probably reboot
   to Debian without completing 🙄
 **** Boot the Ⅴth
 Mornin' Debian; no, actually I was installing Windows updates, you can
 go back to sleep mate.
 
 Windows is probably done with the external storage, right?  Detaching.
 **** Boot the Ⅵth
 - "❌ please reattach external storage"
   - /I freed 5 gigs of Music for you/
   - not even tumbleweed full-distro rebuilds are that big
 **** Boot the Ⅶth
 - "you're up to date (last checked: yesterday, 9:01 PM)"
   - first of all Windows Update: you just spent 15s loading; why is
     the last check yesterday evening?  What were you doing during this
     15s load?
   - second, isn't there, like, a 24H2 or something?
   - "check for updates" again please
 - "updates available" 🤪
 - some downloads later…
   - "you're up to date"
   - /also on the very same window/ "2025-02 Cumulative Update Preview
     for Windows 11 Version 23H2" to "Download & install"
   - 🎭
 - seriously though, is there not an option to climb to 24H2?  why go
   for the "preview" of [[https://en.wikipedia.org/wiki/Windows_11_version_history][a /maintenance/ release]]?
 - maybe a reboot will fix it 🙃
   - woah =⊞ restart=…
     - proposes (LLM-backed?) completion
     - says "restart apps after signing in" is the "best match"
   - woaaah, =⊞ reboot=… says the "best match" is a 2022 TV show 🤣
     - the right margin even autoplays the trailer
     - the right margin also shows "results ranked by relevance" and
       /the first one/ is a Microsoft Support link to "restart
       (reboot)" your PC
   - OK fine, that was "fun"; luckily =⊞-x u r= still works
 **** Boot the Ⅷth
 - well, no, I still must install this "oldstable preview"
 - OK then; do that
 **** Boot the Ⅸth
 - "check for updates"
   - {{{narrator(thinks a lot)}}}
   - "you're up to date (last checked: today, 9:02 AM)"
   - what are you talking about?  It's 9:42, you've just booted, and
     /spent thirty seconds checking for updates/ how can the last check
     be 40 minutes ago??
 - {{{narrator(thinks a lot /again/)}}}
   - "you're right 🤪"
     - "have a security intelligence update"
     - "also, 24H2 is available"
 - just to be on the safe side, start with the "intelligence update"
   then reboot
 **** Boot the Ⅹth
 - alright then, "download & install" 24H2
 - creeps up to 34%
 - "making sure you're ready to install (this may take a few minutes)
   (please wait)"
   - I assure you Windows /I/ am ready to install; please stop
     projecting
 - (wait hang on; why are you saying it's 10:26 AM Paris time; it's
   11:26 AM Paris time you goof)
   - "last successful time synchronization: 1/8/2022 7:01:49 PM" 🤣
 - "what needs your attention"
   - "this PC can't be upgraded to this version of Windows"
   - "your PC isn't supported yet on this version of Windows"
   - what have you spent the last 30 minutes doing?  how do you realize
     this /34% into the installation process??/
   - there's only a "refresh" button that does nothing
     - close
     - "are you sure you want to quit?" /you will literally not let me
       do anything else; why are you asking me??/
 - well then; perhaps disk size?
   - mmm only 6 GB free on =C:/=
   - ah, perhaps the 7 GB =C:/Windows.old= directory is a problem 🙄
   - let's install windirstat I guess
     - winget is neat!
   - I have basically 2 GB of personal files; everything else is
     Windows cruft
   - "System → Storage → Cleanup recommendations" agrees we can reclaim
     the 7 GB =Windows.old=
 **** Alas
 That was all the energy I could muster this week-end.  We might not
 have updated all the way to 24H2, and we might never succeed!  All the
 same, we laughed, we cried; quality entertainment.  Sort of.
 * Hiccups
 ** impromptu IBus
 Installing [[https://zoom.us/][Zoom]]'s Debian package somehow enabled IBus[fn:: AFAICT
 because ibus recommends im-config, and the latter autostarts the
 former by default], which unconditionally set my keyboard to English
 for some reason[fn:: Before properly running ~apt install
 ./zoom_amd64.deb~, I had mistakenly run ~dpkg -i zoom_amd64.deb~,
 which failed because of missing dependencies.  Perhaps apt omitted
 some post-installation configuration hooks because the first dpkg run
 had left an error marker somewhere?].  Remediation steps taken:
 
 1. Tweak IBus preferences, unset shortcuts (Emacs has a better
    interface for searching/inserting Unicode characters), check "use
    system defaults" for the keyboard layout.
 
 2. Go on a hunt for whoever spawns ibus-daemon(1); AFAICT it's
    im-launch(1), which can be told not to use IBus through im-config
    (which eventually just writes ~run_im none~ in =~/.xinputrc=).
 
 3. Eventually, maybe I should just uninstall im-config.
 ** random lag
 *** DONE diagnosing
 Since… a few days? weeks? one month? everything randomly becomes
 "choppy":
 
 - typing (Emacs, Terminator, Firefox): I can type in a bunch of words,
   sit back, wait a few seconds, then watch the words finally write
   themselves letter by letter.
 - launching programs: ~while time $aprogram ; do sleep 0.5 ; done~,
   where ~aprogram~ just starts then exits, shows wildly varying times.
 - scrolling a PDF with the touchpad (Evince): the pages stay stuck for
   a few seconds, then the reader jumps to the new location; the mouse
   pointer does change during this delay, as text and whitespace
   (invisibly) scroll by.
 
 I can't remember changing anything recently, nor seeing any scary
 update passing by.  journalctl, htop and dmesg do not show any obvious
 suspects.  Some things I considered:
 
 - Disabling some services e.g. tor or speech-dispatcher ⇒ no effect.
 - Uninstalling xserver-xorg-video-intel ⇒ no effect.
 - Upgrading systemd from backports ⇒ no effect.
 - htop sometimes shows pulseaudio acting up despite no application
   playing or recording sound?
 - Maybe I should try reinstalling Debian's stable kernel?
   - Luckily 5.7 was not uninstalled when upgrading to 5.8; booting on
     5.7 solves all of the "choppiness" issues listed above.
 
 Now to pinpoint what's wrong with 5.8…
 *** TODO fixing
 Found a way to "quantify" the problem; asked around on the
 debian-kernel mailing list, to no avail.
 
 - [[https://lists.debian.org/debian-kernel/2020/11/msg00084.html][2020-11]] - original report that 5.8 from backports triggers the
   issue: "wait for 5.9 to be available from backports or even 5.10"
   (LTS for the next Debian stable version)
 - [[https://lists.debian.org/debian-kernel/2020/12/msg00040.html][2020-12]] - quick report that 5.9 from backports does not improve
   things: 🦗
 - [[https://lists.debian.org/debian-kernel/2021/02/msg00231.html][2021-02]] - quick report that 5.10 from backports does not improve
   things *✨with scripts & numbers✨*: 🦗
 
 #+begin_quote
     for ((i=0; i<100; i++)); do
         time -p terminator -x 'bash -c exit'
     done &> time-$(uname -r)
 
     grep $mode time-$(uname -r) | sort -k2
 
 Where $mode is either real, user or sys.  Here are the extrema:
 
                         real            user            sys
                         min     max     min     max     min     max
 5.7                     0.44    0.48    0.29    0.35    0.02    0.08
 5.10                    0.47    3.30    0.31    2.87    0.02    0.30
 5.10-after-suspend      0.46    0.50    0.30    0.36    0.03    0.08
 
 Averages & standard deviations:
 
                         real            user            sys
 5.7                     0.454±0.006     0.322±0.013     0.046±0.013
 5.10                    0.961±0.607     0.559±0.518     0.074±0.052
 5.10-after-suspend      0.469±0.005     0.332±0.012     0.050±0.011
 
 These results feel consistent with the stutter I observe: 5.7 and
 5.10-after-suspend have roughly the same performance, while
 freshly-booted 5.10 is overall very jittery: terminator startup is twice
 as slow on average, with 100× more variance.
 
 
 Some more stats, eyeballed from /proc/cpuinfo and
 /sys/devices/system/cpu/cpufreq/policy*/scaling_governor:
 
                         idle frequency  CPU governor
 5.7                     <  800 MHz      powersave
 5.10                    > 1900 MHz      ondemand
 5.10 (after suspend)    <  900 MHz      ondemand
 #+end_quote
 
 - [[https://lists.debian.org/debian-kernel/2021/08/msg00278.html][2021-08]] - quick report that 5.10 from a fresh bullseye install does
   not improve things: 🦗
 - 2023-08 - bookworm upgrade to 6.1: problem solved 🤷