On Thu, 2016-01-14 at 16:07 +0100, Thomas Gleixner wrote:

quoted

I didn't have CONFIG_NO_HZ_FULL enabled, it was CONFIG_NO_HZ_IDLE.

So with the above fix it still behaves badly. Can you provide your config and
a hint which workload/idle/whatever state results in bad behaviour.

This is virgin -rt1 modulo fixlet applied to v4.4.0, built with the
.config from v4.4.0 that built it (modulo RT_FULL) rebuilding itself
via make -j8.

homer:/root # vmstat 10
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  1      0 14742988 179832 680792    0    0   634    25  326 1196  2  1 89  8  0
 8  0      0 14476084 179848 701632    0    0   814   525 2421 12314 11  1 87  1  0
 8  0      0 14483232 179864 712656    0    0   165  1628 2404 12320 11  1 87  1  0
 8  0      0 14493336 180008 727836    0    0   141   762 2328 11306 11  1 87  0  0
 8  0      0 14456436 180024 738356    0    0   159  1478 2336 11939 11  1 87  0  0

Way too idle, taking forever.

	-Mike