linux-kernel - Re: [PATCH] sched/fair: Do not decay new task load on first enqueue

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Message-ID: <20161011103957.GC16071@codeblueprint.co.uk>
Date:   Tue, 11 Oct 2016 11:39:57 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Wanpeng Li <kernellwp@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Yuyang Du <yuyang.du@...el.com>
Subject: Re: [PATCH] sched/fair: Do not decay new task load on first enqueue

On Tue, 11 Oct, at 10:44:25AM, Dietmar Eggemann wrote:
> 
> [...]
> 
> Yeah, you're right. But I can't see any significant difference. IMHO,
> it's all in the noise.
> 
> (A) Performance counter stats for 'perf bench sched messaging -g 100 -l
>     1 -t'
>     # 20 sender and receiver threads per group
>     # 100 groups == 4000 threads run
> 

FWIW, our tests run with 1000 loops, not 1, and we don't use 100
groups for low cpu machines. We tend to test upto $((nproc * 4)).