From: Andreas Mohr <andi@lisas.de>
To: Louis-David Mitterrand <vindex+lists-linux-kernel@apartia.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ksoftirqd/n permanently eating 60% of a CPU
Date: Sun, 12 Sep 2010 20:57:15 +0200 [thread overview]
Message-ID: <20100912185715.GA8775@rhlx01.hs-esslingen.de> (raw)
In-Reply-To: <20100912154138.GA23554@apartia.fr>
> Examining /proc/interrupts shows that "Local timer interrupts" are
> mainly firing.
> Strangely enough, the interrupt storm starts only 5 minutes or so after
> bootup.
So you're saying that the exact change in behaviour after 5 minutes
is a much increased local interrupt activity?
Something that might help in nailing down the source of the CPU load
is doing an oprofile trace (for contexts that aren't in interrupt-off periods, that is).
If it's in fact a local interrupt issue, then people such as Gleixner
or Stultz (timers) or Molnar (APIC) might know further details, IIRC.
And have you tried running powertop or manually (perhaps via sophisticated shell
script) keeping a watch on /proc/timer[list|stats]?
Andreas Mohr
next prev parent reply other threads:[~2010-09-12 18:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-05 17:39 Louis-David Mitterrand
2010-09-12 10:31 ` Andreas Mohr
2010-09-12 15:41 ` Louis-David Mitterrand
2010-09-12 18:57 ` Andreas Mohr [this message]
2010-09-13 7:52 ` Louis-David Mitterrand
2010-09-13 10:09 ` Louis-David Mitterrand
2010-09-12 19:09 ` Andreas Mohr
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=20100912185715.GA8775@rhlx01.hs-esslingen.de \
--to=andi@lisas.de \
--cc=linux-kernel@vger.kernel.org \
--cc=vindex+lists-linux-kernel@apartia.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®