From: Ingo Molnar <mingo@elte.hu>
To: Roland Dreier <rdreier@cisco.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Early hang with 2.6.21-rc4-rt1
Date: Fri, 30 Mar 2007 11:24:34 +0200 [thread overview]
Message-ID: <20070330092434.GA20903@elte.hu> (raw)
In-Reply-To: <20070330090206.GA14324@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> > Great, thanks ... I'm not sure which of the 2 patches fixed things,
> > but I now got the following trace. I've not really analyzed this,
> > but it definitely looks like tun_init() is doing something fishy...
> > ("149776 us maximum-latency"!!)
>
> best would be to enable FUNCTION_TRACING and to do:
>
> echo 1 > /proc/sys/kernel/trace_enabled
> echo 1 > /proc/sys/kernel/mcount_enabled
>
> this will give you an exact trace of what happened, in
> /proc/latency_trace.
btw., if you use -rt, it makes sense to disable the UNWIND options in
the .config - the unwinder causes quite some overhead at places.
Ingo
prev parent reply other threads:[~2007-03-30 9:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-25 5:03 Early hang with 2.6.21-rc4-rt1 Roland Dreier
2007-03-25 5:29 ` Roland Dreier
2007-03-25 7:29 ` Ingo Molnar
2007-03-25 7:34 ` Ingo Molnar
2007-03-25 8:06 ` Ingo Molnar
2007-03-25 16:27 ` Roland Dreier
2007-03-25 7:31 ` Ingo Molnar
2007-03-25 14:35 ` Roland Dreier
2007-03-25 17:01 ` Roland Dreier
2007-03-27 19:22 ` Ingo Molnar
2007-03-27 19:24 ` Ingo Molnar
2007-03-27 19:42 ` Roland Dreier
2007-03-30 9:02 ` Ingo Molnar
2007-03-30 9:24 ` Ingo Molnar [this message]
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=20070330092434.GA20903@elte.hu \
--to=mingo@elte.hu \
--cc=linux-kernel@vger.kernel.org \
--cc=rdreier@cisco.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.