linux-kernel - Re: RT Throtteling with PREEMT-RT on UBIFS root fs update

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Message-ID: <201111171454.18742.tim.sander@hbm.com>
Date:	Thu, 17 Nov 2011 14:54:18 +0100
From:	"Tim Sander" <tim.sander@....com>
To:	"linux-rt-users" <linux-rt-users@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: RT Throtteling with PREEMT-RT on UBIFS root fs update

Hi 

This is just a followup 
> We are having a problem with a slightly patched (some platform patches,
> newest stable ubifs patches) 3.0.7-rt20 kernel after updating the firmware
> on the first boot we get a message:
> sched: RT throttling activated
> and ksoftirqd/0 taking 95% of the cpu time.
RT throtteling is still activate with 3.0.9-rt25 (+ ubifs stable patches) but 
now  ksoftirqd/0 is not going berserk.
> Interestingly this only happens after the ubifs root has been updated on
> the first boot (and not allways). Subsequent boot problems have not been
> seen.
Ok the only nitpik that is left, that the processor activates rt throtteling 
after the first boot with updated ubifs image. 
> Any ideas whats causing this?
Well it can be said that it is not ksoftirqd/0 going berserk which is 
triggering this. So i guess when this message is printed it just shows that 
the cpu had been temporarily overloded with work in interrupt context.
Is there more harm to expect from this message or save to ignore if the 
systemload is normal again?

Best regards
Tim
 
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