Re: Scheduler patches: 6x performance increase when system is under heavy load

From: Peter Zijlstra
Date: Tue Dec 13 2016 - 08:40:59 EST

On Sun, Dec 11, 2016 at 04:41:51PM -0500, Alexandre-Xavier Labonté-Lamoureux wrote:
> Here are my results (using "time make -j32" on my VM that has 4 cores):
> Kernel 4.8.14
> real 26m56.151s
> user 79m52.472s
> sys 7m42.964s
> Same kernel, but patched:
> real 4m25.238s
> user 13m52.932s
> sys 1m25.820s
> I hope you guys will look into this.

Which of the 4 patches does this?

Also, what hypervisor are you using and what does the output of booting
with "sched_debug" look like?

Lastly, can you reproduce on real hardware?