From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dan Magenheimer" Subject: RE: Timer ISR/0: Timer went backwards error... Date: Thu, 3 Jul 2008 08:35:27 -0600 Message-ID: <20080703083527671.00000003744@djm-pc> References: Reply-To: "dan.magenheimer@oracle.com" Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser , Sandesh , "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org Sandesh -- hpet_force was a Xen parameter in Dave Winchell's last hpet patch that hasn't yet been accepted into the tree. However I think it would have only worked on hvm guests. Xen system time's dependency on tsc is most susceptible on pre-Barcelona SMP AMD boxes (where tsc isn't synchronized between processors), though yours seems to have a very bad skew. As Keir suggests "clocksource=3Dhpet" as a Xen command line parameter will hopefully work for those boxes. Dan > -----Original Message----- > From: xen-devel-bounces@lists.xensource.com > [mailto:xen-devel-bounces@lists.xensource.com]On Behalf Of Keir Fraser > Sent: Thursday, July 03, 2008 6:30 AM > To: Sandesh; xen-devel@lists.xensource.com > Subject: Re: [Xen-devel] Timer ISR/0: Timer went backwards error... > = > = > hpet_force=3D1 means nothing to Xen. To see what platform timer = > is being used, > look for a line 'Platform timer is ' in Xen's boot = > output. To change > it, specify for example 'clocksource=3Dhpet' as a Xen boot parameter. > = > Could you also send a few of the 'went backwards' messages, = > so we can see > how badly time is getting skewed. Perhaps we can work out = > where the issue > arises from too -- it seems that a significant proprotion of = > those who have > issues with these messages are seeing them on AMD boxes. I = > haven't confirmed > the correlation though. > = > -- Keir > = > On 3/7/08 12:44, "Sandesh" wrote: > = > > Hi all, > > I am getting lots of Timer ISR/0: Timer went backwards error... > > due to which my dom0 is crashing. I tried hpet_force=3D1 = > argument for xen > > command line even then the problem presists. Other than = > that i could not > > find any solution on the net. > > Has this problem been resolved?? > > > > Iam using AMD Athlon(tm) 64bit processor, installed with FC6 & > > xen-3.2.0. > > > > Thanks, > > Sandesh > > > > > > Please do not print this email unless it is absolutely necessary. > > > > The information contained in this electronic message and = > any attachments to > > this message are intended for the exclusive use of the = > addressee(s) and may > > contain proprietary, confidential or privileged = > information. If you are not > > the intended recipient, you should not disseminate, = > distribute or copy this > > e-mail. Please notify the sender immediately and destroy = > all copies of this > > message and any attachments. > > > > WARNING: Computer viruses can be transmitted via email. The = > recipient should > > check this email and any attachments for the presence of = > viruses. The company > > accepts no liability for any damage caused by any virus = > transmitted by this > > email. > > > > www.wipro.com > > > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.xensource.com > > http://lists.xensource.com/xen-devel > = > = > = > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >