linux-kernel - Re: [ANNOUNCE] 3.0.1-rt11

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Date:	Tue, 16 Aug 2011 07:17:07 -0700
From:	Nivedita Singhvi <niv@...ibm.com>
To:	Mike Galbraith <efault@....de>
CC:	paulmck@...ux.vnet.ibm.com, Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.0.1-rt11

Mike Galbraith wrote:
> On Sat, 2011-08-13 at 09:27 -0700, Paul E. McKenney wrote:
> 
>> Strange.  By the time it got around to printing the stall, no one was
>> stalling:
>>
>> [  100.409012] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 21, t=60002 jiffies)
>>
>> Now it -is- possible for the stall to end just as we get ready to detect
>> it, but that window is really really small.  The most recent occurrence
>> of this sort of thing was due misconfigured timekeeping, but I don't see
>> any sign of that in the trace.
>>
>> This happens repeatedly?
> 
> Yeah.  When I put -rt9 on the UV box, it was doing the just idling, and
> boom thing I saw with earlier releases on both my Q6600 and x3550 M3
> boxes.  -rt10 seems to have just changed the timing.
> 
> I'll update the x3550 M3, and see if it still gripes.  UV isn't virgin
> source, has to be twiddled a little. (symptom was identical though)

Mike,

Which test were you running? Because I'm not seeing it
on our x3550 M3..

thanks,
Nivedita
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