linux-kernel - Re: [sched/fair] fcf0553db6: netperf.Throughput

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Message-ID: <20201005065101.GE2628@hirez.programming.kicks-ass.net>
Date:   Mon, 5 Oct 2020 08:51:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...e.de>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Ben Segall <bsegall@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Galbraith <efault@....de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com, ying.huang@...el.com, feng.tang@...el.com,
        zhengjun.xing@...el.com, aubrey.li@...ux.intel.com,
        yu.c.chen@...el.com
Subject: Re: [sched/fair] fcf0553db6: netperf.Throughput_Mbps -30.8%
 regression

On Sun, Oct 04, 2020 at 05:21:08PM +0100, Mel Gorman wrote:
> On Sun, Oct 04, 2020 at 09:27:16PM +0800, kernel test robot wrote:
> > Greeting,
> > 
> > FYI, we noticed a -30.8% regression of netperf.Throughput_Mbps due to commit:
> > 
> > 
> > commit: fcf0553db6f4c79387864f6e4ab4a891601f395e ("sched/fair: Remove meaningless imbalance calculation")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> > 
> 
> This commit was the start of a series that made large changes to load
> balancing.  The series was not bisect-safe and has since been reconciled
> with the NUMA balancing. Any workload with a potential load balancing
> problem has to be checked against the latest kernel to see if the problem
> persists there. If it does, then tip/sched/core should be checked or
> 5.10-rc1 when it comes out as tip has a few more LB changes pending.

What Mel said ;-)