On 01/04/2018 10:09 PM, Rob wrote: > On 04/01/18 19:56, Paul Davis wrote: >> >> On Thu, Jan 4, 2018 at 2:43 PM, Robin Gareus <robin@xxxxxxxxxx >> <mailto:robin@xxxxxxxxxx>> 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 tha 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. > > https://lwn.net/Articles/741878/ - top-most page table is duplicated and > stripped of kernel pages; duplicate is active when running userspace. > Thanks for the heads up. I stand corrected. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
