Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-00
From: Lee Revell <rlrevell@joe-job.com>
To: "K.R. Foley" <kr@cybsft.com>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       "Paul E. McKenney" <paulmck@us.ibm.com>
In-Reply-To: <423CD6E0.2000806@cybsft.com>
References: <20050319191658.GA5921@elte.hu>
	 <1111282389.15947.2.camel@mindpipe>  <423CD6E0.2000806@cybsft.com>
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Date: Sat, 19 Mar 2005 23:32:59 -0500
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On Sat, 2005-03-19 at 19:50 -0600, K.R. Foley wrote:
> Lee Revell wrote:
> > On Sat, 2005-03-19 at 20:16 +0100, Ingo Molnar wrote:
> > 
> >>the biggest change in this patch is the merge of Paul E. McKenney's
> >>preemptable RCU code. The new RCU code is active on PREEMPT_RT. While it
> >>is still quite experimental at this stage, it allowed the removal of
> >>locking cruft (mainly in the networking code), so it could solve some of
> >>the longstanding netfilter/networking deadlocks/crashes reported by a
> >>number of people. Be careful nevertheless.
> > 
> > 
> > With PREEMPT_RT my machine deadlocked within 20 minutes of boot.
> > "apt-get dist-upgrade" seemed to trigger the crash.  I did not see any
> > Oops unfortunately.
> > 
> > Lee
> > 
> 
> Lee,
> 
> Just curious. Is this with UP or SMP? I currently have my UP box running 
>   PREEMPT_RT, with no problems thus far. However, my SMP box dies while 
> booting (with an oops). I am working on trying to get setup to capture 
> the oops, although it might be tomorrow before I get that done.
> 

UP.  It's 100% reproducible, this machine locks up over and over.  Seems
to be associated with network activity by multiple processes.

Lee

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