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Date: Tue, 13 Dec 2016 14:40:54 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Alexandre-Xavier =?iso-8859-1?Q?Labont=E9-Lamoureux?= 
        <axdoomer@gmail.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>
Subject: Re: Scheduler patches: 6x performance increase when system is under
 heavy load
Message-ID: <20161213134054.GU3207@twins.programming.kicks-ass.net>
References: <CAKTMqxumNvrmjSgso-n0gAj78Px5uJbwMTgndwWSMEJefz58eQ@mail.gmail.com>
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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?