On Wed, 6 Jan 2016 01:55:37 +0100 "Steinar H. Gunderson" <[email protected]> wrote:
> On Tue, Jan 05, 2016 at 04:53:14PM -0800, Stephen Hemminger wrote: > >> Also, I've never ever seen the actual context switch turn up high in a perf > >> profile. Is this because of some sampling artifact? > > Yes, especially with Intel processors getting more and more SSE/floating > > point > > registers. > > But those are not saved on context switch to the kernel, no? (Thus the rule > of no floating-point in the kernel.) Only if you switch between userspace > processes Right that just punts the work to the kernel when it context switches to next process. _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
