On 04/01/18 19:56, Paul Davis wrote:
>
> On Thu, Jan 4, 2018 at 2:43 PM, Robin Gareus <robin@email-addr-hidden
> <mailto:robin@email-addr-hidden>> 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.
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Received on Fri Jan 5 00:15:02 2018
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