[LAU] Major CPU bugs - Was: Christmas present for self.

Fons Adriaensen fons at linuxaudio.org
Thu Jan 4 20:27:25 UTC 2018


On Thu, Jan 04, 2018 at 02:56:46PM -0500, Paul Davis wrote:

> 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.

That is what I understood as well. Maybe this will affect systems
using very small period sizes, we'll see.

Ciao,

-- 
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)



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