From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Tim Sander" Subject: Re: RT Throtteling with PREEMT-RT on UBIFS root fs update Date: Thu, 17 Nov 2011 14:54:18 +0100 Message-ID: <201111171454.18742.tim.sander@hbm.com> References: <201111111056.53803.tim.sander@hbm.com> Mime-Version: 1.0 Content-Type: text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE To: "linux-rt-users" , "LKML" Return-path: Received: from relay.medianet-world.de ([213.157.0.172]:33816 "HELO relay.medianet-world.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1757642Ab1KQNzp convert rfc822-to-8bit (ORCPT ); Thu, 17 Nov 2011 08:55:45 -0500 Content-Class: urn:content-classes:message In-Reply-To: <201111111056.53803.tim.sander@hbm.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi=20 This is just a followup=20 > We are having a problem with a slightly patched (some platform patche= s, > newest stable ubifs patches) 3.0.7-rt20 kernel after updating the fir= mware > 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 patche= s) but=20 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 b= een > seen. Ok the only nitpik that is left, that the processor activates rt thrott= eling=20 after the first boot with updated ubifs image.=20 > Any ideas whats causing this? Well it can be said that it is not ksoftirqd/0 going berserk which is=20 triggering this. So i guess when this message is printed it just shows = that=20 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= =20 systemload is normal again? Best regards Tim =20 > Sorry for noise below, please ignore: Hottinger Baldwin Messtechnik GmbH, Im Tiefen See 45, 64293 Darmstadt, = Germany | www.hbm.com=20 Registered as GmbH (German limited liability corporation) in the commer= cial register at the local court of Darmstadt, HRB 1147 =20 Company domiciled in Darmstadt | CEO: Andreas Huellhorst | Chairman of = the board: James Charles Webster Als Gesellschaft mit beschraenkter Haftung eingetragen im Handelsregist= er des Amtsgerichts Darmstadt unter HRB 1147=20 Sitz der Gesellschaft: Darmstadt | Geschaeftsfuehrung: Andreas Huellhor= st | Aufsichtsratsvorsitzender: James Charles Webster The information in this email is confidential. It is intended solely fo= r the addressee. If you are not the intended recipient, please let me k= now and delete this email. Die in dieser E-Mail enthaltene Information ist vertraulich und ledigli= ch f=FCr den Empfaenger bestimmt. Sollten Sie nicht der eigentliche Emp= faenger sein, informieren Sie mich bitte kurz und loeschen diese E-Mail= =2E -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html