On Thu, Jan 4, 2018 at 2:43 PM, Robin Gareus <robin@gareus.org> wrote:

Depends on your DAW. In Ardour's case there is no context-switch. All
tracks, Busses and FX run in the same process. So there won't be any
direct effect.

Low-latency I/O however (soundcard) will see additional overhead, as
will JACK with multiple clients (one context switch per client).

​is this correct? my impression is that KPTI makes user->kernel and kernel->user switches more expensive th​a they used to be, but does not change the cost of a context switch that stays in the same ring mode.

​

so, basically, system calls cost more; context switches stay at about the same cost.