Linux-rt-users archive on lore.kernel.org
 help / color / Atom feed
From: Michael Nazzareno Trimarchi <michael@amarulasolutions.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>, linux-rt-users@vger.kernel.org
Subject: Re: linux-rt stall on imx6dl on patch-5.4.22-rt13.patch
Date: Fri, 29 May 2020 15:46:46 +0200
Message-ID: <CAOf5uwmQnX8SNOxD71mwcxc5Q4hKXo1VqnMbaSArNg0SmE5dqA@mail.gmail.com> (raw)
In-Reply-To: <20200529133107.y65eta5btvgpk6pu@linutronix.de>

Hi

On Fri, May 29, 2020 at 3:31 PM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> On 2020-05-29 10:08:01 [+0200], Michael Nazzareno Trimarchi wrote:
> > Hi all
> Hi,
>
> > I get this stack trace
> > echo 3 > /proc/sys/vm/drop_caches chrt -f 99 sysbench --test=cpu --num-threads=2
> >
> > First of all, I need to know that if it is a valid use case because
> > was raised by the testing team and
> > how can I start and where to take a look at it
>
> Assuming that there is a `;' in front of `chrt' then I wouldn't be
> surprised. You are basically keeping two CPUs busy with sysbench at RT
> priority and then wondering why the system isn't making any progress. If
> it wouldn't be for the RT throttler, you might not even see any output
> and box hardware would appear be dead.

No, I'm not surprised but my answer to them was not enough. Right now
they are executing some bench.

Best
Michael
>
> > Best Regards
> > Michael
> >
> > [  161.709260] 001: sh (480): drop_caches: 3
> > [  180.234358] 001: sched: RT throttling activated
> > [  180.283363] 001: fec 2188000.ethernet eth0: MDIO read timeout
> > [  180.283406] 001: ------------[ cut here ]------------
> > [  180.283416] 001: WARNING: CPU: 1 PID: 133 at
> > drivers/net/phy/phy.c:716 phy_er
> >
> >                                                ror+0x24/0x64
> > [  180.283460] 001: Modules linked in:
> > [  180.283473] 001: CPU: 1 PID: 133 Comm: kworker/1:2 Tainted: G
> >  W
>
> This is hard to read. Especially later in that mail. In future please
> try to not cut the lines.
>
> Sebastian



-- 
| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
|                  [`as] http://www.amarulasolutions.com               |

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  8:08 Michael Nazzareno Trimarchi
2020-05-29 13:31 ` Sebastian Andrzej Siewior
2020-05-29 13:46   ` Michael Nazzareno Trimarchi [this message]
2020-05-29 14:48     ` Sebastian Andrzej Siewior

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=CAOf5uwmQnX8SNOxD71mwcxc5Q4hKXo1VqnMbaSArNg0SmE5dqA@mail.gmail.com \
    --to=michael@amarulasolutions.com \
    --cc=bigeasy@linutronix.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rt-users@vger.kernel.org \
    /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

Linux-rt-users archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-rt-users/0 linux-rt-users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-rt-users linux-rt-users/ https://lore.kernel.org/linux-rt-users \
		linux-rt-users@vger.kernel.org
	public-inbox-index linux-rt-users

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-rt-users


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git