Re: [lkp] [mm] 795ae7a0de: pixz.throughput -9.1% regression

From: Ye Xiaolong
Date: Thu Jun 02 2016 - 22:27:23 EST

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In reply to: Johannes Weiner: "Re: [lkp] [mm] 795ae7a0de: pixz.throughput -9.1% regression"
Next in thread: Mel Gorman: "Re: [lkp] [mm] 795ae7a0de: pixz.throughput -9.1% regression"
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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.
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min 367
low 1112
high 1857
scanned 0
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present 762317
managed 745925
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Node 1, zone Normal
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cpu: 37
count: 132
high: 186
batch: 31
vm stats threshold: 108
cpu: 38
count: 143
high: 186
batch: 31
vm stats threshold: 108
cpu: 39
count: 107
high: 186
batch: 31
vm stats threshold: 108
cpu: 40
count: 92
high: 186
batch: 31
vm stats threshold: 108
cpu: 41
count: 130
high: 186
batch: 31
vm stats threshold: 108
cpu: 42
count: 100
high: 186
batch: 31
vm stats threshold: 108
cpu: 43
count: 38
high: 186
batch: 31
vm stats threshold: 108
cpu: 44
count: 166
high: 186
batch: 31
vm stats threshold: 108
cpu: 45
count: 24
high: 186
batch: 31
vm stats threshold: 108
cpu: 46
count: 45
high: 186
batch: 31
vm stats threshold: 108
cpu: 47
count: 72
high: 186
batch: 31
vm stats threshold: 108
all_unreclaimable: 0
start_pfn: 8650752
inactive_ratio: 17

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