From: Mel Gorman <mgorman@techsingularity.net>
To: Jirka Hladky <jhladky@redhat.com>
Cc: Kamil Kolakowski <kkolakow@redhat.com>,
Jakub Racek <jracek@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org
Subject: Re: [4.17 regression] Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks
Date: Thu, 6 Sep 2018 13:58:43 +0100 [thread overview]
Message-ID: <20180906125843.GC1719@techsingularity.net> (raw)
In-Reply-To: <CAE4VaGATB4M7-osmi0wqovGbZb7os+ukMHi+Lbum3tegpHxGNw@mail.gmail.com>
On Thu, Sep 06, 2018 at 10:16:28AM +0200, Jirka Hladky wrote:
> Hi Mel,
>
> we have results with 2d4056fafa196e1ab4e7161bae4df76f9602d56d reverted.
>
> * Compared to 4.18, there is still performance regression -
> especially with NAS (sp_C_x subtest) and SPECjvm2008. On 4 NUMA
> systems, regression is around 10-15%
> * Compared to 4.19rc1 there is a clear gain across all benchmarks around 20%
>
Ok.
> While reverting 2d4056fafa196e1ab4e7161bae4df76f9602d56d has helped a
> lot there is another issue as well. Could you please recommend some
> commit prior to 2d4056fafa196e1ab4e7161bae4df76f9602d56d to try?
>
Maybe 305c1fac3225dfa7eeb89bfe91b7335a6edd5172. That introduces a weird
condition in terms of idle CPU handling that has been problematic.
> Regarding the current results, how do we proceed? Could you please
> contact Srikar and ask for the advice or should we contact him
> directly?
>
I would suggest contacting Srikar directly. While I'm working on a
series that touches off some similar areas, there is no guarantee it'll
be a success as I'm not primarily upstream focused at the moment.
Restarting the thread would also end up with a much more sensible cc
list.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2018-09-06 12:58 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAE4VaGBRFBM-uZEE=DdUzQkcNmpnUHdjK-7hgEeywmG8bvOOgw@mail.gmail.com>
2018-06-11 14:11 ` [4.17 regression] Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks Mel Gorman
[not found] ` <CAE4VaGCMS2pXfPVSnMbudexv_m5wRCTuBKA5ijh2x==11uQg9g@mail.gmail.com>
2018-06-14 8:36 ` Mel Gorman
[not found] ` <CAE4VaGCzB99es_TpAaYvtjX8fqzFA=7HX-ezqgO6FaEB5if4zg@mail.gmail.com>
2018-06-15 11:25 ` Mel Gorman
[not found] ` <CAE4VaGBtasbDBoZ-c5R-AY++Y1BXgjrE7DwN0zOt113xmV95xw@mail.gmail.com>
2018-06-15 13:52 ` Mel Gorman
[not found] ` <CAE4VaGAdXNYXMUn4eQgMqQtLKfp6-YHMa1NUSpL-L078oX7C-w@mail.gmail.com>
[not found] ` <CAE4VaGBeTpxd1phR4rVAjqOXuLgLWPtVMPoRSOcG3HXfWDF=8w@mail.gmail.com>
2018-06-19 15:18 ` Mel Gorman
[not found] ` <CAE4VaGAPOfy0RtQehKoe+443C1GRrJXCveBFgcAZ1nChVavp1g@mail.gmail.com>
[not found] ` <CAE4VaGBMeL82SJK53gtcWkor-9eXeLX6VP9juw=FW=BOyp+hMA@mail.gmail.com>
2018-06-21 9:23 ` Mel Gorman
[not found] ` <CAE4VaGCQV+cS-vhdLyMwzftbB-xBHPt4Y4chg_0ykLHTE9cRfw@mail.gmail.com>
[not found] ` <CAE4VaGDHcZbnDpJ+FiQLfA1DRftY0j_GJSnh3FDRi34OztVH6Q@mail.gmail.com>
2018-06-27 8:49 ` Mel Gorman
[not found] ` <CAE4VaGA9KzX05rdfw2PhEATLisV-NVMc9rOyjzSg-rX1rug9Dw@mail.gmail.com>
[not found] ` <CABuKy6MUNX85PBVchz_hqXy+FxXU2x0U9ZEZB13rVSLGpWOWvQ@mail.gmail.com>
[not found] ` <CAE4VaGD12BLS_kk=pRwgTKL8YOU63Nowwa42cEdZObQ=P1MFnA@mail.gmail.com>
[not found] ` <CAE4VaGArxDYHzg8G203yKjgkuw3mULFSw8yCYbCcqvAUSUxy+A@mail.gmail.com>
2018-07-17 10:03 ` Mel Gorman
[not found] ` <CAE4VaGA_L1AEj+Un0oQEEqZp_jgaFLk+Z=vNoad08oXnU2T1nw@mail.gmail.com>
2018-09-03 15:07 ` Jirka Hladky
2018-09-04 9:00 ` Mel Gorman
2018-09-04 10:07 ` Jirka Hladky
2018-09-06 8:16 ` Jirka Hladky
2018-09-06 12:58 ` Mel Gorman [this message]
2018-09-07 8:09 ` Jirka Hladky
2018-09-14 16:50 ` Jirka Hladky
2018-06-06 12:27 Jakub Racek
2018-06-06 12:34 ` Rafael J. Wysocki
2018-06-06 12:44 ` Rafael J. Wysocki
2018-06-07 11:07 ` Michal Hocko
2018-06-07 11:19 ` Jakub Raček
2018-06-07 12:39 ` Mel Gorman
[not found] ` <CAE4VaGBAZ0HCy-M2rC3ce9ePOBhE6H-LDVBuJDJMNFf40j70Aw@mail.gmail.com>
2018-06-08 7:40 ` Mel Gorman
[not found] ` <CAE4VaGAgC7vDwaa-9AzJYst9hdQ5KbnrBUnk_mfp=NeTEe5dAQ@mail.gmail.com>
2018-06-08 9:24 ` Mel Gorman
[not found] ` <CAE4VaGATk3_Hr_2Wh44BZvXDc06A=rxUZXRFj+D=Xwh2x1YOyg@mail.gmail.com>
2018-06-08 11:15 ` Mel Gorman
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