linux-kernel - Re: sysbench throughput degradation in 4.13+

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Message-ID: <20170928123618.xn2gklm3uoz4kuzc@hirez.programming.kicks-ass.net>
Date:   Thu, 28 Sep 2017 14:36:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rik van Riel <riel@...hat.com>
Cc:     Eric Farman <farman@...ux.vnet.ibm.com>,
        ????????? <jinpuwang@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "KVM-ML (kvm@...r.kernel.org)" <kvm@...r.kernel.org>,
        vcaputo@...garu.com, Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
Subject: Re: sysbench throughput degradation in 4.13+

On Wed, Sep 27, 2017 at 01:58:20PM -0400, Rik van Riel wrote:
> I like the simplicity of your approach!  I hope it does not break
> stuff like netperf...

So the old approach that looks at the weight of the two CPUs behaves
slightly better in the overloaded case. On the threads==nr_cpus load
points they match fairly evenly.

I seem to have misplaced my netperf scripts, but I'll have a play with
it.