From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from zimbra.somanetworks.com (gw-yyz.somanetworks.com [216.126.67.39]) by bilbo.ozlabs.org (Postfix) with ESMTP id EF04EB7B8E for ; Tue, 1 Sep 2009 21:20:50 +1000 (EST) Message-ID: <4A9D038F.90605@somanetworks.com> Date: Tue, 01 Sep 2009 07:20:47 -0400 From: Benjamin Gamsa MIME-Version: 1.0 To: Benjamin Herrenschmidt Subject: Re: time jumps forward/backwards References: <4A9C465D.4010801@somanetworks.com> <19100.24755.889091.412993@cargo.ozlabs.ibm.com> <4A9C6446.2000202@somanetworks.com> <4A9C664D.6010504@somanetworks.com> <4A9C84D0.8040200@somanetworks.com> <20090831223111.7b2dc95d@lappy.seanm.ca> <4A9C9BA3.6020105@somanetworks.com> <1251802154.14675.346.camel@pasglop> In-Reply-To: <1251802154.14675.346.camel@pasglop> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: Paul Mackerras , linuxppc-dev@lists.ozlabs.org, Sean MacLennan List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Benjamin Herrenschmidt wrote: > On Mon, 2009-08-31 at 23:57 -0400, Benjamin Gamsa wrote: >> Sean MacLennan wrote: >>> On Mon, 31 Aug 2009 22:20:00 -0400 >>> Benjamin Gamsa wrote: >>> >>>> For what it's worth, the problem occurs even when ntp is not even >>>> started. >>> This is grasping, but could it have anything to do with the jiffies >>> wrapping near startup? >>> >> I don't know how to test it, but I don't think so, since there are >> multiple of these glitches over an extended period of time. > > I'm not familiar with all the FSL processor variants, but is this > an UP or an SMP platform ? In the later case, are all the core timebases > properly synchronized ? > This a UP with a single e500 core. ben