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

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Message-ID: <CALidq=UYNMxLQTT_D=EOESUxr82LYH04YCjT6igwqdnw3YwyiA@mail.gmail.com>
Date:   Wed, 8 Jul 2020 11:34:52 +0300
From:   Martin Zaharinov <micron10@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     "linux-kernel@...r kernel. org" <linux-kernel@...r.kernel.org>,
        Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: Bug Report High CPU Usage events_power_efficient

Yes i search but not find any information.

And write hear to help if any have same problem or any of you have
idea from where is comme this problem.

If need more debug i will only write how to get more information.

Martin


На ср, 8.07.2020 г. в 10:09 Greg KH <gregkh@...uxfoundation.org> написа:
>
> On Wed, Jul 08, 2020 at 09:50:49AM +0300, Martin Zaharinov wrote:
> > 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 .
>
> Have you used 'git bisect' to try to find the offending commit?
>
> Without that, it's going to be hard to help you out here.
>
> thanks,
>
> greg k-h