From: Michal Hocko <mhocko@kernel.org>
To: Jakub Racek <jracek@redhat.com>
Cc: linux-kernel@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org
Subject: Re: [4.17 regression] Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks
Date: Thu, 7 Jun 2018 13:07:13 +0200 [thread overview]
Message-ID: <20180607110713.GJ32433@dhcp22.suse.cz> (raw)
In-Reply-To: <20180606122731.GB27707@jra-laptop.brq.redhat.com>
[CCing Mel and MM mailing list]
On Wed 06-06-18 14:27:32, Jakub Racek wrote:
> Hi,
>
> There is a huge performance regression on the 2 and 4 NUMA node systems on
> stream benchmark with 4.17 kernel compared to 4.16 kernel. Stream, Linpack
> and NAS parallel benchmarks show upto 50% performance drop.
>
> When running for example 20 stream processes in parallel, we see the following behavior:
>
> * all processes are started at NODE #1
> * memory is also allocated on NODE #1
> * roughly half of the processes are moved to the NODE #0 very quickly. *
> however, memory is not moved to NODE #0 and stays allocated on NODE #1
>
> As the result, half of the processes are running on NODE#0 with memory being
> still allocated on NODE#1. This leads to non-local memory accesses
> on the high Remote-To-Local Memory Access Ratio on the numatop charts.
>
> So it seems that 4.17 is not doing a good job to move the memory to the right NUMA
> node after the process has been moved.
>
> ----8<----
>
> The above is an excerpt from performance testing on 4.16 and 4.17 kernels.
>
> For now I'm merely making sure the problem is reported.
Do you have numa balancing enabled?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-06-07 11:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-06 12:27 [4.17 regression] Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks Jakub Racek
2018-06-06 12:34 ` Rafael J. Wysocki
2018-06-06 12:44 ` Rafael J. Wysocki
2018-06-06 12:50 ` Jakub Racek
2018-06-06 12:56 ` Rafael J. Wysocki
2018-06-07 11:07 ` Michal Hocko [this message]
2018-06-07 11:19 ` [4.17 regression] " 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
[not found] <CAE4VaGBRFBM-uZEE=DdUzQkcNmpnUHdjK-7hgEeywmG8bvOOgw@mail.gmail.com>
2018-06-11 14:11 ` 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
2018-09-07 8:09 ` Jirka Hladky
2018-09-14 16:50 ` Jirka Hladky
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