linux-kernel - Re: Bug Report High CPU Usage events_power

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Date:   Wed, 8 Jul 2020 09:50:49 +0300
From:   Martin Zaharinov <micron10@...il.com>
To:     "linux-kernel@...r kernel. org" <linux-kernel@...r.kernel.org>
Cc:     gregkh@...uxfoundation.org, Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: Bug Report High CPU Usage events_power_efficient

Add Greg , Florian, Eric to this bug 

> On 7 Jul 2020, at 22:54, Martin Zaharinov <micron10@...il.com> wrote:
> 
> And this is log from /sys/kernel/debug/tracing/trace
> 
> 
> # entries-in-buffer/entries-written: 32410/32410   #P:64
> #
> #                              _-----=> irqs-off
> #                             / _----=> need-resched
> #                            | / _---=> hardirq/softirq
> #                            || / _--=> preempt-depth
> #                            ||| /     delay
> #           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
> #              | |       |   ||||       |         |
>           <...>-57259 [005] .... 29619.680698: workqueue_execute_start: work struct 00000000ef22e4b8: function gc_worker [nf_conntrack]
>           <...>-57259 [005] .... 29623.811407: workqueue_execute_end: work struct 00000000ef22e4b8: function gc_worker [nf_conntrack]
>           <...>-57259 [005] .... 29623.811410: workqueue_execute_start: work struct 0000000000aeec55: function fb_flashcursor
>           <...>-57259 [005] .... 29623.811421: workqueue_execute_end: work struct 0000000000aeec55: function fb_flashcursor
>           <...>-57259 [005] .... 29623.811422: workqueue_execute_start: work struct 00000000a6d382bb: function vmstat_update
>           <...>-57259 [005] .... 29623.811435: workqueue_execute_end: work struct 00000000a6d382bb: function vmstat_update
> 
>> On 7 Jul 2020, at 22:44, Martin Zaharinov <micron10@...il.com> wrote:
>> 
>> the problem is hear with kernel 5.7.7 
>> 
>> last work kernel without this problem is 5.6.7
>> 
>> hear is more info:
>> 
>> cat /proc/57259/stack
>> root@...acableamarilis:~# cat /proc/57259/stack
>> [<0>] gc_worker+0x1be/0x380 [nf_conntrack]
>> [<0>] process_one_work+0x1bc/0x3b0
>> [<0>] worker_thread+0x4d/0x460
>> [<0>] kthread+0x10d/0x130
>> [<0>] ret_from_fork+0x1f/0x30
>> 
>> PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                            57259 root      28   0       0      0      0 R  69.8   0.0  82:42.14 kworker/5:2+events_power_efficient                                                          
>> 32 root      21   0       0      0      0 R  31.0   0.0  87:06.33 ksoftirqd/4
>> 
>> 
>> Please help to fix this problem
>> 
>>> On 22 Apr 2020, at 15:55, Martin Zaharinov <micron10@...il.com> wrote:
>>> 
>>> Hello Qian and Greg 
>>> With latest 5.6.x kernel have problem with events_power_efficient 28488 root      28   0       0      0      0 R  95.5   0.0 101:38.19 kworker/2:1+events_power_efficient Process start to load machine after 3-4 hour and load not stop only reboot machine remove process . Server runing on AMD EPIC CPU 2x 7301 32Gb Ram Have 2 x 10G card Intel when machine load over 1G traffic machine locked and only restart fix problem to next load . After move traffic and server stop load process still hear and load server ?
>>> And after reboot process move to other core .
>>> 
>>> Best Regards,
>>> Martin
>> 
>