From: Dave Jones <davej@redhat.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: paulmck@linux.vnet.ibm.com,
Linux Kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: rcu_preempt running flat out on idle desktop.
Date: Thu, 6 Jun 2013 11:31:36 -0400 [thread overview]
Message-ID: <20130606153136.GA12823@redhat.com> (raw)
In-Reply-To: <20130514012105.GB12749@somewhere>
On Tue, May 14, 2013 at 03:21:07AM +0200, Frederic Weisbecker wrote:
> On Thu, May 09, 2013 at 05:10:26PM -0400, Dave Jones wrote:
> > On Thu, May 09, 2013 at 11:02:08PM +0200, Frederic Weisbecker wrote:
> >
> > > > RCU options for this build are..
> > > >
> > > I can't reproduce that issue even with the above setting. Could you
> > > please send me your whole config?
> >
> > http://paste.fedoraproject.org/11363/36813375/raw/
>
> Sorry it took me some time to get that config booting, I ran into
> other unrelated crashes.
>
> So I'm observing the exact opposite than you: the processes appear to
> have no load nor to consume cputime. Even if I use some dumb user loop.
> Top don't even show it.
>
> I'm digging further and will tell you when I get more info.
So I'm still seeing this on rc4.
Here's my 'idle' firewall, just routing packets:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4405 root 20 0 0 0 0 S 400.0 0.0 52336:27 kworker/2:0
20968 davej 20 0 115m 1840 1092 R 400.0 0.1 2297:48 top
964 named 20 0 383m 32m 2896 S 400.0 1.7 81384:54 named
10 root 20 0 0 0 0 S 400.0 0.0 195403:05 rcu_preempt
20830 davej 20 0 125m 2172 1024 S 400.0 0.1 939:36.10 sshd
11 root 20 0 0 0 0 S 400.0 0.0 42644:33 rcuop/0
13 root 20 0 0 0 0 S 400.0 0.0 34729:04 rcuop/2
754 lighttpd 20 0 54640 2692 1732 S 400.0 0.1 35286:11 lighttpd
756 root 20 0 216m 10m 6116 S 400.0 0.5 34143:41 snmpd
35 root 20 0 0 0 0 S 400.0 0.0 12790:56 ksoftirqd/2
19893 root 20 0 0 0 0 S 400.0 0.0 12570:49 kworker/0:1
20059 root 20 0 0 0 0 S 400.0 0.0 4666:30 kworker/1:1
32 root rt 0 0 0 0 S 400.0 0.0 8780:22 watchdog/2
792 root 20 0 92220 2516 632 S 400.0 0.1 7821:28 sendmail
25 root rt 0 0 0 0 S 400.0 0.0 8780:21 watchdog/0
26 root rt 0 0 0 0 S 400.0 0.0 8780:22 watchdog/1
38 root rt 0 0 0 0 S 400.0 0.0 8780:22 watchdog/3
19167 root 20 0 0 0 0 S 400.0 0.0 7804:04 kworker/3:2
Every process is either 400%, or 0%.
Here's my desktop box, just writing this email:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10 root 20 0 0 0 0 S 200.0 0.0 35134:00 rcu_preempt
12 root 20 0 0 0 0 S 200.0 0.0 14059:47 rcuop/1
12528 root 20 0 0 0 0 S 200.0 0.0 1012:56 kworker/0:1
12999 davej 20 0 115m 1700 956 R 200.0 0.1 1:09.10 top
4799 root 20 0 0 0 0 S 200.0 0.0 3510:40 kworker/1:1
1 root 20 0 50760 5092 1648 S 0.0 0.2 3:14.96 systemd
2 root 20 0 0 0 0 S 0.0 0.0 1:40.55 kthreadd
Every process 200% or 0%.
Dave
next prev parent reply other threads:[~2013-06-06 15:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-08 20:30 rcu_preempt running flat out on idle desktop Dave Jones
2013-05-08 20:52 ` Paul E. McKenney
2013-05-08 20:56 ` Dave Jones
2013-05-08 21:16 ` Paul E. McKenney
2013-05-08 21:17 ` Dave Jones
2013-05-08 22:20 ` Paul E. McKenney
2013-05-09 9:04 ` Frederic Weisbecker
2013-05-09 9:20 ` Ingo Molnar
2013-05-09 21:02 ` Frederic Weisbecker
2013-05-09 21:10 ` Dave Jones
2013-05-14 1:21 ` Frederic Weisbecker
2013-06-06 15:31 ` Dave Jones [this message]
2013-06-06 15:43 ` Frederic Weisbecker
2013-06-06 23:10 ` Dave Jones
2013-06-12 15:34 ` Dave Jones
2013-06-20 19:10 ` Dave Jones
2013-06-23 10:58 ` Ingo Molnar
2013-07-01 12:10 ` Frederic Weisbecker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130606153136.GA12823@redhat.com \
--to=davej@redhat.com \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.