pipewire: Update realtime settings

.config/pipewire/pipewire.conf

@@ -0,0 +1,15 @@
+context.modules = [
+{   name = libpipewire-module-rt
+    args = {
+        nice.level   = -19
+        rt.prio      = 95
+        rt.time.soft = -1
+        rt.time.hard = -1
+        rlimits.enabled = true
+        rtportal.enabled = true
+        rtkit.enabled = true
+    }
+    flags = [ ifexists nofail ]
+}
+]
+

.dotfiles/arch_install.md

@@ -310,7 +310,8 @@ Use `visudo` to uncomment the following line
 # %sudo ALL=(ALL:ALL) ALL
 ```
 
-Create user account with sudo and journal access
+Create user account with sudo and journal access.
+Also add user to the `pipewire` group to make use of the configured realtime limits for pipewire.
 
 ```console
 # useradd -m -G sudo,systemd-journal -s /bin/zsh histalek
@@ -394,6 +395,29 @@ Create zram config file `/etc/systemd/zram-generator.conf`, e.g.:
 zram-size = min(ram, 8192)
 ```
 
+### Setup realtime limits for pipewire
+
+Create dedicated group
+
+```console
+$ sudo groupadd pipewire
+```
+
+Add user to group
+
+```console
+$ sudo usermod -aG pipewire histalek
+```
+
+Create `/etc/security/limits.d/95-pipewire.conf` with the following content
+
+```console
+# Default limits for users of pipewire
+@pipewire - rtprio 95
+@pipewire - nice -19
+@pipewire - memlock 4194304
+```
+
 ### (optional) Configure boot splash screen
 
 Note: As of early April 2023 `plymouth` is now in the arch community repo.