Public bug reported:
Problem summary:
----------------
System is a Raspberry Pi 4 Model B Rev 1.4 (8Gb)
While you are connected to a gnome-remote-desktop session in Wayland
(using either RDP or VNC backends) the system log is populated with
these kind of messages several times per second:
...
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 4194304
bytes), total 32768 (slots), used 14 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 4194304
bytes), total 32768 (slots), used 106 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 1933312
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 4194304
bytes), total 32768 (slots), used 14 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 4194304
bytes), total 32768 (slots), used 106 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400
bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:13 fpgrpi kernel: swiotlb_tbl_map_single: 82 callbacks suppressed
...
The gnome-remote-desktop session works as expected but performance is
degraded.
These messages stops when you disconnect to gnome-remote-desktop
session.
While you are connected to a gnome-remote-desktop session under X11
there are no messages at all and performance is better. So it seems to
be a Wayland only problem.
How to reproduce:
-----------------
Connect to a gnome-remote-session under Wayland (it doesn't care if you connect
to RDP or VNC backend). These messages will start to populate system log
immediately.
Aditional info:
---------------
# lsb_release -rd
Description: Ubuntu 22.04 LTS
Release: 22.04
#uname -a
Linux fpgrpi 5.15.0-1011-raspi #13-Ubuntu SMP PREEMPT Thu Jun 2 11:44:34 UTC
2022 aarch64 aarch64 aarch64 GNU/Linux
#apt-cache policy gnome-remote-desktop
gnome-remote-desktop:
Instalados: 42.1.1-0ubuntu1
Candidato: 42.1.1-0ubuntu1
Tabla de versión:
*** 42.1.1-0ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main arm64
Packages
100 /var/lib/dpkg/status
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-raspi in Ubuntu.
https://bugs.launchpad.net/bugs/1978051
Title:
"kernel: vc4-drm gpu: swiotlb buffer is full" messages when connected
to a gnome-remote-desktop session in wayland
Status in linux-raspi package in Ubuntu:
New
Bug description:
Problem summary:
----------------
System is a Raspberry Pi 4 Model B Rev 1.4 (8Gb)
While you are connected to a gnome-remote-desktop session in Wayland
(using either RDP or VNC backends) the system log is populated with
these kind of messages several times per second:
...
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
4194304 bytes), total 32768 (slots), used 14 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
4194304 bytes), total 32768 (slots), used 106 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
8294400 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
8294400 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
8294400 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:08 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
8294400 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
1933312 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
4194304 bytes), total 32768 (slots), used 14 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
4194304 bytes), total 32768 (slots), used 106 (slots)
jun 08 10:13:09 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz:
8294400 bytes), total 32768 (slots), used 2 (slots)
jun 08 10:13:13 fpgrpi kernel: swiotlb_tbl_map_single: 82 callbacks suppressed
...
The gnome-remote-desktop session works as expected but performance is
degraded.
These messages stops when you disconnect to gnome-remote-desktop
session.
While you are connected to a gnome-remote-desktop session under X11
there are no messages at all and performance is better. So it seems to
be a Wayland only problem.
How to reproduce:
-----------------
Connect to a gnome-remote-session under Wayland (it doesn't care if you
connect to RDP or VNC backend). These messages will start to populate system
log immediately.
Aditional info:
---------------
# lsb_release -rd
Description: Ubuntu 22.04 LTS
Release: 22.04
#uname -a
Linux fpgrpi 5.15.0-1011-raspi #13-Ubuntu SMP PREEMPT Thu Jun 2 11:44:34 UTC
2022 aarch64 aarch64 aarch64 GNU/Linux
#apt-cache policy gnome-remote-desktop
gnome-remote-desktop:
Instalados: 42.1.1-0ubuntu1
Candidato: 42.1.1-0ubuntu1
Tabla de versión:
*** 42.1.1-0ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main arm64
Packages
100 /var/lib/dpkg/status
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1978051/+subscriptions
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