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

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Date:   Tue, 11 Oct 2016 19:57:59 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     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>,
        Dietmar Eggemann <dietmar.eggemann@....com>
Subject: Re: [PATCH] sched/fair: Do not decay new task load on first enqueue

On Tue, 11 Oct, at 03:14:47PM, Vincent Guittot wrote:
> >
> > I see a regression,
> >
> >   baseline: 2.41228
> >   patched : 2.64528 (-9.7%)
> 
> Just to be sure; By baseline you mean v4.8 ?
 
Baseline is actually tip/sched/core commit 447976ef4fd0
("sched/irqtime: Consolidate irqtime flushing code") but I could try
out v4.8 instead if you'd prefer that.

> >       cat /tmp/trace.$1 | grep -E "wakeup_new.*comm=hackbench" | \
> >         sed -e 's/.*target_cpu=//' | sort | uniq -c | awk '{print $1}'
> 
> nice command to evaluate spread

Thanks!