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--- wiki:system_configuration [2020/03/17 21:21] – [The kernel] autostatic
+++ wiki:system_configuration [2020/06/08 11:51] – [How do I build a real-time audio workstation on Linux?] grammo
@@ Line 6: / Line 6: @@
 ===== How do I build a real-time audio workstation on Linux? =====
+The [[https://manual.ardour.org/setting-up-your-system/the-right-computer-system-for-digital-audio/|Ardour manual]] has a interesting introduction about getting the right computer system for digital audio. Below that article there is also a (somewhat Windows oriented) [[https://www.youtube.com/watch?v=GUsLLEkswzE| video]] by Richard Ames, which could be helpful to get a idea which things are involved for this topic. Summary: lots of things are involved for a well performing real-time audio workstation. It's not simply a matter of buying a computer with massive CPU and memory power, as the coming sections on this page shows.
+A good starting point for optimizing your system for real-time audio on GNU/Linux, is the QuickScan script below (as a newbie you might want to ignore the hardware timers settings first).
+After adjusting your system using the recommendations of the QuickScan and with JACK (QjackCtl) and a2jmidid installed, the basics should be there for a good performing real-time audio system (depending on your hardware too of course).
 ==== Preliminary ====
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 This is only needed for so-called generic kernels, ie. standard kernels that are not tweaked for lowlatency performance. You can check if your kernel already includes this option with the following command:
-  $ grep -e "CONFIG_IRQ_FORCED_THREADING=y" -e "CONFIG_PREEMPT=y" /boot/config-`uname -r`
+  $ grep -e "CONFIG_IRQ_FORCED_THREADING=y" -e "CONFIG_PREEMPT_RT=y" /boot/config-`uname -r`
-If it returns ''CONFIG_IRQ_FORCED_THREADING=y'' and ''CONFIG_PREEMPT=y'' then your kernel is using IRQ threading and you don't have to proceed with the following steps. If it only returns ''CONFIG_IRQ_FORCED_THREADING=y'' you can add the ''threadirqs'' boot option as described below. If the command returns nothing you have a kernel that cannot use threaded IRQs.
+If it returns ''CONFIG_IRQ_FORCED_THREADING=y'' and ''CONFIG_PREEMPT_RT=y'' then your kernel is using IRQ threading and you don't have to proceed with the following steps. If it only returns ''CONFIG_IRQ_FORCED_THREADING=y'' you can add the ''threadirqs'' boot option as described below. If the command returns nothing you have a kernel that cannot use threaded IRQs.
 Open ''/etc/default/grub'' with your favorite editor as root.
@@ Line 93: / Line 99: @@
 == Gentoo ==
-AN audio overlay can be found here [[https://github.com/gentoo-audio/audio-overlay]].
+An audio overlay can be found here [[https://github.com/gentoo-audio/audio-overlay]].
 === Build your own real-time kernel ===
-If your distribution isn't any help, you can compile and install a real-time kernel manually. The examples assume building a RT kernel based on the 3.2 kernel version but they should generally apply fo other kernel versions too provided that there is a RT patchset available for the used kernel.
+If your distribution isn't any help, you can compile and install a real-time kernel manually. The examples assume building a RT kernel based on the 4.8 kernel version but they should generally apply for other kernel versions too provided that there is a RT patchset available for the used kernel.
 Install the necessary packages, on Debian and Ubuntu this is:
@@ Line 198: / Line 204: @@
-Then you can compile...
+Then you can compile.
   make clean
   make deb-pkg