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

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Message-ID: <20171003083932.3qa7jw2spmi5n5pg@hirez.programming.kicks-ass.net>
Date:   Tue, 3 Oct 2017 10:39:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Rik van Riel <riel@...hat.com>,
        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 Mon, Oct 02, 2017 at 11:53:12PM +0100, Matt Fleming wrote:
> On Wed, 27 Sep, at 01:58:20PM, Rik van Riel wrote:
> > 
> > I like the simplicity of your approach!  I hope it does not break
> > stuff like netperf...
> > 
> > I have been working on the patch below, which is much less optimistic
> > about when to do an affine wakeup than before.
> 
> Running netperf for this patch and Peter's patch shows that Peter's
> comes out on top, with scores pretty close to v4.12 in most places on
> my 2-NUMA node 48-CPU Xeon box.
> 
> I haven't dug any further into why v4.13-peterz+ is worse than v4.12,
> but I will next week.

So I was waiting for Rik, who promised to run a bunch of NUMA workloads
over the weekend.

The trivial thing regresses a wee bit on the overloaded case, I've not
yet tried to fix it.