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

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Message-ID: <20161213134054.GU3207@twins.programming.kicks-ass.net>
Date:   Tue, 13 Dec 2016 14:40:54 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexandre-Xavier Labonté-Lamoureux 
        <axdoomer@...il.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: Scheduler patches: 6x performance increase when system is under
 heavy load

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?