[Bloat] Hardware upticks

[Stephen Hemminger]

On Wed, 6 Jan 2016 01:55:37 +0100
"Steinar H. Gunderson" <sgunderson at bigfoot.com> 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.