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

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Date:   Fri, 22 Sep 2017 17:53:48 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Eric Farman <farman@...ux.vnet.ibm.com>
Cc:     Rik van Riel <riel@...hat.com>,
        王金浦 <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 Fri, Sep 22, 2017 at 11:03:39AM -0400, Eric Farman wrote:
> Hi Peter, Rik,
> 
> With OSS last week, I'm sure this got lost in the deluge, so here's a
> friendly ping.

Very much so, inbox is a giant trainwreck ;-)

> I picked up 4.14.0-rc1 earlier this week, and still see the
> degradation described above.  Not really a surprise, since I don't see any
> other commits in this area beyond the ones I mentioned in my original note.
> 
> Anyway, I'm unsure what else to try or what doc to pull to help debug this,
> and would appreciate your expertise here.  We can repro this pretty easily
> as necessary to help get to the bottom of this.
> 
> Many thanks in advance,

Could you describe your sysbench setup? Are you running it on mysql or
postgresql, what other options?