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

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Date:   Tue, 03 Oct 2017 12:02:41 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Eric Farman <farman@...ux.vnet.ibm.com>,
        ????????? <jinpuwang@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, jhladky@...hat.com,
        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 Tue, 2017-10-03 at 10:39 +0200, Peter Zijlstra wrote:
> 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.

In Jirka's tests, your simple patch also came out
on top.

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