From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Minchan Kim <minchan@kernel.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Vinayak Menon <vinmenon@codeaurora.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
lkp@01.org
Subject: Re: [lkp] [mm] 5c0a85fad9: unixbench.score -6.3% regression
Date: Mon, 6 Jun 2016 12:51:36 +0300 [thread overview]
Message-ID: <20160606095136.GA79951@black.fi.intel.com> (raw)
In-Reply-To: <20160606022724.GA26227@yexl-desktop>
On Mon, Jun 06, 2016 at 10:27:24AM +0800, kernel test robot wrote:
>
> FYI, we noticed a -6.3% regression of unixbench.score due to commit:
>
> commit 5c0a85fad949212b3e059692deecdeed74ae7ec7 ("mm: make faultaround produce old ptes")
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> in testcase: unixbench
> on test machine: lituya: 16 threads Haswell High-end Desktop (i7-5960X 3.0G) with 16G memory
> with following parameters: cpufreq_governor=performance/nr_task=1/test=shell8
>
>
> Details are as below:
> -------------------------------------------------------------------------------------------------->
>
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/nr_task/rootfs/tbox_group/test/testcase:
> gcc-4.9/performance/x86_64-rhel/1/debian-x86_64-2015-02-07.cgz/lituya/shell8/unixbench
>
> commit:
> 4b50bcc7eda4d3cc9e3f2a0aa60e590fedf728c5
> 5c0a85fad949212b3e059692deecdeed74ae7ec7
>
> 4b50bcc7eda4d3cc 5c0a85fad949212b3e059692de
> ---------------- --------------------------
> fail:runs %reproduction fail:runs
> | | |
> 3:4 -75% :4 kmsg.DHCP/BOOTP:Reply_not_for_us,op[#]xid[#]
> %stddev %change %stddev
> \ | \
> 14321 ± 0% -6.3% 13425 ± 0% unixbench.score
> 1996897 ± 0% -6.1% 1874635 ± 0% unixbench.time.involuntary_context_switches
> 1.721e+08 ± 0% -6.2% 1.613e+08 ± 0% unixbench.time.minor_page_faults
> 758.65 ± 0% -3.0% 735.86 ± 0% unixbench.time.system_time
> 387.66 ± 0% +5.4% 408.49 ± 0% unixbench.time.user_time
> 5950278 ± 0% -6.2% 5583456 ± 0% unixbench.time.voluntary_context_switches
That's weird.
I don't understand why the change would reduce number or minor faults.
It should stay the same on x86-64. Rise of user_time is puzzling too.
Hm. Is reproducible? Across reboot?
--
Kirill A. Shutemov
next prev parent reply other threads:[~2016-06-06 9:51 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 2:27 [lkp] [mm] 5c0a85fad9: unixbench.score -6.3% regression kernel test robot
2016-06-06 9:51 ` Kirill A. Shutemov [this message]
2016-06-08 7:21 ` [LKP] " Huang, Ying
2016-06-08 8:41 ` Huang, Ying
2016-06-08 8:58 ` Kirill A. Shutemov
2016-06-12 0:49 ` Huang, Ying
2016-06-12 1:02 ` Linus Torvalds
2016-06-13 9:02 ` Huang, Ying
2016-06-14 13:38 ` Minchan Kim
2016-06-15 23:42 ` Huang, Ying
2016-06-13 12:52 ` Kirill A. Shutemov
2016-06-14 6:11 ` Linus Torvalds
2016-06-14 8:26 ` Kirill A. Shutemov
2016-06-14 16:07 ` Rik van Riel
2016-06-14 14:03 ` Christian Borntraeger
2016-06-14 8:57 ` Minchan Kim
2016-06-14 14:34 ` Kirill A. Shutemov
2016-06-15 23:52 ` Huang, Ying
2016-06-16 0:13 ` Minchan Kim
2016-06-16 22:27 ` Huang, Ying
2016-06-17 5:41 ` Minchan Kim
2016-06-17 19:26 ` Huang, Ying
2016-06-20 0:06 ` Minchan Kim
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