From: Ye Xiaolong <xiaolong.ye@intel.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
lkp@01.org
Subject: Re: [lkp] [mm] 795ae7a0de: pixz.throughput -9.1% regression
Date: Fri, 3 Jun 2016 10:25:31 +0800 [thread overview]
Message-ID: <20160603022531.GB3271@yexl-desktop> (raw)
In-Reply-To: <20160602160706.GA24004@cmpxchg.org>
[-- Attachment #1: Type: text/plain, Size: 3847 bytes --]
On Thu, Jun 02, 2016 at 12:07:06PM -0400, Johannes Weiner wrote:
>Hi,
>
>On Thu, Jun 02, 2016 at 02:45:07PM +0800, kernel test robot wrote:
>> FYI, we noticed pixz.throughput -9.1% regression due to commit:
>>
>> commit 795ae7a0de6b834a0cc202aa55c190ef81496665 ("mm: scale kswapd watermarks in proportion to memory")
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>
>> in testcase: pixz
>> on test machine: ivb43: 48 threads Ivytown Ivy Bridge-EP with 64G memory with following parameters: cpufreq_governor=performance/nr_threads=100%
>
>Xiaolong, thanks for the report.
>
>It looks like the regression stems from a change in NUMA placement:
>
>> 3ed3a4f0ddffece9 795ae7a0de6b834a0cc202aa55
>> ---------------- --------------------------
>> %stddev %change %stddev
>> \ | \
>> 78505362 ± 0% -9.1% 71324131 ± 0% pixz.throughput
>> 4530 ± 0% +1.0% 4575 ± 0% pixz.time.percent_of_cpu_this_job_got
>> 14911 ± 0% +2.3% 15251 ± 0% pixz.time.user_time
>> 6586930 ± 0% -7.5% 6093751 ± 1% pixz.time.voluntary_context_switches
>> 49869 ± 1% -9.0% 45401 ± 0% vmstat.system.cs
>> 26406 ± 4% -9.4% 23922 ± 5% numa-meminfo.node0.SReclaimable
>> 4803 ± 85% -87.0% 625.25 ± 16% numa-meminfo.node1.Inactive(anon)
>> 946.75 ± 3% +775.4% 8288 ± 1% proc-vmstat.nr_alloc_batch
>> 2403080 ± 2% -58.4% 999765 ± 0% proc-vmstat.pgalloc_dma32
>
>a bit clearer in the will-it-scale report:
>
>> 3ed3a4f0ddffece9 795ae7a0de6b834a0cc202aa55
>> ---------------- --------------------------
>> %stddev %change %stddev
>> \ | \
>> 442409 ± 0% -8.5% 404670 ± 0% will-it-scale.per_process_ops
>> 397397 ± 0% -6.2% 372741 ± 0% will-it-scale.per_thread_ops
>> 0.11 ± 1% -15.1% 0.10 ± 0% will-it-scale.scalability
>> 9933 ± 10% +17.8% 11696 ± 4% will-it-scale.time.involuntary_context_switches
>> 5158470 ± 3% +5.4% 5438873 ± 0% will-it-scale.time.maximum_resident_set_size
>> 10701739 ± 0% -11.6% 9456315 ± 0% will-it-scale.time.minor_page_faults
>> 825.00 ± 0% +7.8% 889.75 ± 0% will-it-scale.time.percent_of_cpu_this_job_got
>> 2484 ± 0% +7.8% 2678 ± 0% will-it-scale.time.system_time
>> 81.98 ± 0% +8.7% 89.08 ± 0% will-it-scale.time.user_time
>> 848972 ± 1% -13.3% 735967 ± 0% will-it-scale.time.voluntary_context_switches
>> 19395253 ± 0% -20.0% 15511908 ± 0% numa-numastat.node0.local_node
>> 19400671 ± 0% -20.0% 15518877 ± 0% numa-numastat.node0.numa_hit
>
>The way this test is set up (in-memory compression on 48 nodes) I'm
>surprised we spill over, though, even with the higher watermarks.
>
>Xiaolong, could you provide the full /proc/zoneinfo of that machine
>right before the test is running? I wonder if it's mostly filled with
Hi, Johannes
Please refer to attached proc-zoneinfo file which was obtained by cat /proc/zoneinfo
on test machine ivb43 right before the test (pigxz) was launched.
Thanks,
Xiaolong
>cache, and the increase in watermarks causes a higher portion of the
>anon allocs and frees to spill to the remote node, but never enough to
>enter the allocator slowpath and waking kswapd to fix it.
>
>Another suspect is the fair zone allocator, whose allocation batches
>increased as well. It shouldn't affect NUMA placement, but I wonder if
>there is a bug in there that causes false spilling to foreign nodes
>that was only bounded by the allocation batch of the foreign zone.
>Mel, does such a symptom sound familiar in any way?
>
>I'll continue to investigate.
[-- Attachment #2: proc-zoneinfo --]
[-- Type: text/plain, Size: 25976 bytes --]
Node 0, zone DMA
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all_unreclaimable: 0
start_pfn: 8650752
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next prev parent reply other threads:[~2016-06-03 2:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <574fd097.Frf8OIpckXVh1oaw%xiaolong.ye@intel.com>
2016-06-02 6:45 ` [lkp] [mm] 795ae7a0de: pixz.throughput -9.1% regression kernel test robot
2016-06-02 16:07 ` Johannes Weiner
2016-06-03 2:25 ` Ye Xiaolong [this message]
2016-06-03 9:00 ` Mel Gorman
2016-06-03 22:21 ` Johannes Weiner
2016-06-06 8:53 ` Ye Xiaolong
2016-06-07 4:48 ` [LKP] " Ye Xiaolong
2016-06-07 21:56 ` Johannes Weiner
2016-06-08 5:37 ` Ye Xiaolong
2016-06-22 21:24 ` Johannes Weiner
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