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

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Date:   Thu, 28 Sep 2017 11:08:49 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Eric Farman <farman@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Rik van Riel <riel@...hat.com>,
        王金浦 <jinpuwang@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.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 09/27/2017 06:27 PM, Eric Farman wrote:
> 
> 
> On 09/27/2017 05:35 AM, Peter Zijlstra wrote:
>> On Fri, Sep 22, 2017 at 12:12:45PM -0400, Eric Farman wrote:
>>>
>>> MySQL.  We've tried a few different configs with both test=oltp and
>>> test=threads, but both show the same behavior.  What I have settled on for
>>> my repro is the following:
>>>
>>
>> Right, didn't even need to run it in a guest to observe a regression.
>>
>> So the below cures native sysbench and NAS bench for me, does it also
>> work for you virt thingy?
[...]

> --test=oltp
> Baseline:    5655.26 transactions/second
> Patched:    9618.13 transactions/second
> 
> --test=threads
> Baseline:    25482.9 events/sec
> Patched:    29577.9 events/sec
> 
> That's good!  With that...
> 
> Tested-by: Eric Farman <farman@...ux.vnet.ibm.com>
> 
> Thanks!
> 
>  - Eric

Assuming that we settle on this or Riks alternative patch.
Are we going to schedule this for 4.13 stable as well?