linux-kernel - Re: deadlocks if use htb

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Message-ID: <Pine.LNX.4.64.0901151340540.20461@nacho.alt.net>
Date:	Thu, 15 Jan 2009 13:53:09 +0000 (UTC)
From:	Chris Caputo <ccaputo@....net>
To:	Jarek Poplawski <jarkao2@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
cc:	Denys Fedoryschenko <denys@...p.net.lb>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Badalian Vyacheslav <slavon@...telecom.ru>
Subject: Re: deadlocks if use htb

On Thu, 15 Jan 2009, Jarek Poplawski wrote:
> On Thu, Jan 15, 2009 at 12:00:50PM +0000, Chris Caputo wrote:
> ...
> > I wish I had a repro scenario in a non-production environment, so I could 
> > help out further with this.  If I did, I would test without nmi_watchdog 
> > while trying just 2.6.28 and Jarek's #4 patch.
> 
> I think this watchdog doesn't matter too much yet. Probably it's more
> about hardware (smp, maybe kind of hw timer), and high traffic vs. htb
> rules.

Per Thomas' comment in http://bugzilla.kernel.org/show_bug.cgi?id=10944 
regarding broken hrtimers:

--
  nmi_watchdog=1 disables the local apic timers and therefor highres/nohz

  Try to use nmi_watchdog=2 instead.
--

Chris
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