Bugzilla – Bug 1223460
Btrfs-cleaner causes Pageflip timeout on kde mobile
Last modified: 2024-05-09 08:31:57 UTC
I believe you should consider a different scheduler other than None for btrfs with snapper. I am running kde plasma mobile and btrfs-cleaner will hang the DE while it runs. Fortunately, the problem will fix itself after a minute or two. I do not care too much about the CPU usage. I havn't tried kyber, mq-deadline, or bfq to see whether it solves the issue. System Information LCD Steam Deck. cat /sys/block/nvme0n1/queue/scheduler [none] mq-deadline kyber bfq Operating System: openSUSE Tumbleweed 20240426 KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.1.0 Qt Version: 6.7.0 Kernel Version: 6.8.7-1-default (64-bit) Graphics Platform: Wayland Processors: 8 × AMD Custom APU 0405 Memory: 13.5 GiB of RAM Graphics Processor: AMD Custom GPU 0405 Manufacturer: Valve Product Name: Jupiter System Version: 1 NVME Identify Controller: vid : 0x15b7 ssvid : 0x15b7 sn : 233101400993 mn : WD_BLACK SN770M 1TB sudo btrfs qgroup show / Qgroupid Referenced Exclusive Path -------- ---------- --------- ---- 0/5 16.00KiB 16.00KiB <toplevel> 0/256 16.00KiB 16.00KiB @ 0/257 15.78GiB 15.78GiB @/var 0/258 16.00KiB 16.00KiB @/usr/local 0/259 16.00KiB 16.00KiB @/srv 0/260 2.60MiB 2.60MiB @/root 0/261 16.00KiB 16.00KiB @/opt 0/262 70.44GiB 70.44GiB @/home 0/263 4.21MiB 4.21MiB @/boot/grub2/x86_64-efi 0/264 16.00KiB 16.00KiB @/boot/grub2/i386-pc 0/265 1020.00KiB 1020.00KiB @/.snapshots 0/610 16.00KiB 16.00KiB @/var/lib/machines 0/1013 21.59GiB 36.60MiB @/.snapshots/741/snapshot 0/1221 0.00B 0.00B <stale> 0/1222 0.00B 0.00B <stale> 0/1223 21.66GiB 524.43MiB @/.snapshots/951/snapshot 0/1224 21.32GiB 114.02MiB @/.snapshots/952/snapshot 0/1229 21.25GiB 237.35MiB @/.snapshots/957/snapshot 0/1230 21.65GiB 1.66MiB @/.snapshots/958/snapshot 0/1231 21.65GiB 1.80MiB @/.snapshots/959/snapshot 0/1232 21.26GiB 9.66MiB @/.snapshots/960/snapshot 0/1233 21.26GiB 19.21MiB @/.snapshots/961/snapshot 0/1234 21.29GiB 697.49MiB @/.snapshots/962/snapshot 0/1257 0.00B 0.00B <stale> 0/1258 0.00B 0.00B <stale> 0/1259 21.33GiB 94.70MiB @/.snapshots/983/snapshot 0/1260 21.38GiB 96.00KiB @/.snapshots/984/snapshot 0/1261 21.38GiB 128.00KiB @/.snapshots/985/snapshot 0/1262 21.38GiB 144.00KiB @/.snapshots/986/snapshot 0/1263 21.38GiB 224.00KiB @/.snapshots/987/snapshot 0/1264 21.39GiB 128.00KiB @/.snapshots/988/snapshot 0/1265 21.39GiB 128.00KiB @/.snapshots/989/snapshot 0/1266 21.58GiB 2.31MiB @/.snapshots/990/snapshot 0/1267 21.58GiB 1.92MiB @/.snapshots/991/snapshot 0/1268 21.59GiB 8.55MiB @/.snapshots/992/snapshot 1/0 32.19GiB 10.63GiB <0 member qgroups> 255/610 16.00KiB 16.00KiB <0 member qgroups> ``` Apr 27 14:48:16 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Apr 27 14:48:21 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Apr 27 14:48:26 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Apr 27 14:48:30 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:30 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:30 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_preferred_language(> Apr 27 14:48:30 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_content_type(uint32> Apr 27 14:48:30 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_commit_state(uint32> Apr 27 14:48:35 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:35 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:35 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_preferred_language(> Apr 27 14:48:35 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_content_type(uint32> Apr 27 14:48:35 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_commit_state(uint32> Apr 27 14:48:45 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:45 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_surrounding_text(co> Apr 27 14:48:45 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_preferred_language(> Apr 27 14:48:45 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_content_type(uint32> Apr 27 14:48:45 steamdeck.lan maliit-keyboard[3157]: maliit.connection.wayland: virtual void Maliit::Wayland::InputMethodContext::zwp_input_method_context_v1_commit_state(uint32> Apr 27 14:48:59 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Apr 27 14:49:04 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Apr 27 14:49:09 steamdeck.lan kwin_wayland[3066]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug ```
Related discussions https://github.com/pop-os/default-settings/pull/149 I do not know which default should be better for the end user. It is obvious that none stops the world which isn't good for interactivity.
Created attachment 874545 [details] dmesg-kyber Apr 29 02:31:27 steamdeck.lan kwin_wayland[3186]: kwin_libinput: Libinput: event18 - Lenovo TrackPoint Keyboard II: client bug: event processing lagging behind by 98ms, your system is too slow
Apr 29 02:31:27 steamdeck.lan kwin_wayland[3186]: kwin_libinput: Libinput: event18 - Lenovo TrackPoint Keyboard II: client bug: event processing lagging behind by 98ms, your system is too slow With kyber, stop the world pauses still happen but it doesn't reach a full minute. Improvement but it doesn't solve the issue yet. Kwin does not complain about pageflip, but it does complain about input.
# 3. For "real" multiqueue devices, the kernel defaults to no IO scheduling # Uncomment this (and select your scheduler) if you need an IO scheduler for them TEST=="%S%p/mq/1", ATTR{queue/scheduler}="kyber", GOTO="scheduler_end" # 4. BFQ scheduler for every device (uncomment if you need ionice or blk-cgroup features) # ATTR{queue/scheduler}="bfq", GOTO="scheduler_end" # 5. mq-deadline is the kernel default for devices with just one hardware queue # ATTR{queue/scheduler}="mq-deadline" # --- EDIT ABOVE HERE after copying to /etc/udev/rules.d --- LABEL="scheduler_end" doof@steamdeck:~> cat /sys/block/nvme0n1/queue/scheduler none mq-deadline [kyber] bfq