From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthias Fuchs Subject: Re: 3.12.6-rt9 on AM335x (armv7) Date: Wed, 08 Jan 2014 09:08:52 +0100 Message-ID: <52CD0794.8030009@ma-fu.de> References: <52C44448.3030405@ma-fu.de> <15611103.51LOkxSQt9@dabox> <52CC6F94.6070906@ma-fu.de> <10785809.PZUZGWPMgY@hydra> <52CC91E9.7070808@pavlinux.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-rt-users To: pavel@pavlinux.ru, Tim Sander Return-path: Received: from mo4-p00-ob.smtp.rzone.de ([81.169.146.216]:52785 "EHLO mo4-p00-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753919AbaAHIIs (ORCPT ); Wed, 8 Jan 2014 03:08:48 -0500 In-Reply-To: <52CC91E9.7070808@pavlinux.ru> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hmm, on Intel it might be an SMI-Issue. Matthias On 08.01.2014 00:46, Pavel Vasilyev wrote: > 08.01.2014 02:58, Tim Sander =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >=20 >> Yeah 118 =C2=B5s should be the right ballpark, while still a little = high for my=20 >> taste. All cortex a8 seem to have rather high latency. The A9's seem= much=20 >> better in this respect. >=20 > On my Intel Atom D425, latency around 25-30 =C2=B5s (but peaks upto 5= 000 =C2=B5s :/ ) >=20 >> >> Have you seen the following: >> https://www.osadl.org/Realtime-Preempt-Kernel.kernel-rt.0.html#laten= cyfighting >> >> Cyclictest has tracing support which might help finding the cause of= the long=20 >> latency.=20 >> >=20 >=20 -- 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