[LAU] XanMod kernel

rosea.grammostola rosea.grammostola at gmail.com
Sun Jun 7 13:21:59 CEST 2020

On 6/4/20 3:09 PM, Paul Davis wrote:
> This is wrong. The behavior of a "normal", "low latency" and 
> "preempt-RT" kernel are all different, and for realtime audio work, 
> the correct behavior is only going to happen with a "preempt-RT" kernel.
> However ...
> The behavior of the normal and "low latency" kernels have changed over 
> the years too, and on *some* systems (from a hardware perspective), 
> they will function similarly enough to a "preempt-RT" kernel that a 
> realtime audio workflow will be just fine. In addition, the "behavior" 
> gap between a "preempt-RT" kernel and a normal kernel will be less and 
> less apparent as the latency settings (buffer/period size) become more 
> relaxed (i.e. grow larger).
> How do you know which systems this is true for? You just have to try 
> it. It is a complicated mixture of many different aspects of the 
> hardware. There's an overview of the kinds of things that can 
> contribute to the need for a "preempt-RT" kernel here:
> https://manual.ardour.org/setting-up-your-system/the-right-computer-system-for-digital-audio/
Useful information.

Fwiw, I did my best to optimize a thinkpad t420 laptop for linuxaudio 
using the realtime script from the wiki mostly and the information in 
the Ardour docs.

At least I can run Zynaddsubfx with 0.726 msec latency now without xruns 
using a cheap Behringer usb device. ;)

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