From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ralf Schenk Subject: Re: [PATCH] Disable Xen PowerNow! support on Opteron 2nd gen and earlier processors Date: Mon, 11 Feb 2008 12:27:05 +0100 Message-ID: <47B03109.60209@databay.de> References: <1449F58C868D8D4E9C72945771150BDF02077275@SAUSEXMB1.amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <1449F58C868D8D4E9C72945771150BDF02077275@SAUSEXMB1.amd.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Langsdorf, Mark" Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Langsdorf, Mark schrieb: >>> Actually I've now eyeballed the problem. We access a stack=20 >>> variable after the stack frame is gone away. Probably we >>> therefore end up setting a CPU's frequency to zero, which >>> is not good at all. I'll work up a fix. >> Changeset 16927 should fix the problem for you. >=20 > 16927 seems to have resolved the problem. I'll be running > a stress test in the background all day, but the prelimary > results show that: >=20 > a) the machine isn't locking up on boot any more > b) pstate transitions are possible without having the time > go backwards on a regular basis >=20 > Ian was right about the design of Xen's time-keeping. >=20 > -Mark Langsdorf > Operating System Research Center > AMD >=20 > PS - Ralk, could you please test this on your machine? Hello, thanks for your discussion and efforts to solve the Problems. For your information: I'm running ondemand scheduler in Dom0 now with (XEN) Xen version 3.2.1-rc1-pre (root@office.databay.de) (gcc version=20 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) Sat Feb 9 13:07:11 CET 2008 (XEN) Latest ChangeSet: Wed Feb 06 10:06:35 2008 +0000 16759:d26b1b777fde since Saturday and I haven't had "Time went backwards" messages in my=20 DomU's so far. Switching is working depending on the CPU Load in Domu as=20 expected. But mostly the system stays at 1Ghz. From cpuinfo: processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ stepping : 2 cpu MHz : 1000.000 cache size : 512 KB Bye --=20 __________________________________________________ Ralf Schenk fon (02 41) 9 91 21-0 fax (02 41) 9 91 21-59 rs@databay.de Databay AG H=FCttenstra=DFe 7 D-52068 Aachen www.databay.de Vorstand: Jens Conze, Ralf Schenk, Aresch Yavari Aufsichtsratvorsitzender: Ansgar V=F6geli Sitz/Amtsgericht Aachen HRB:8437 USt-IdNr.: DE 210844202 Databay - einfach machen. _________________________________________________ Diese E-Mail und etwa angeh=E4ngte Dateien enthalten vertrauliche Informationen und sind ausschlie=DFlich f=FCr den Adressaten bestimmt. Sollten Sie irrt=FCmlich diese E-Mail erhalten haben, bitten wir Sie, uns dar=FCber unter info@databay.de zu informieren und die E-Mail aus Ihrem System zu l=F6schen. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify info@databay.de. If you are not the named recipient, you should return this message and delete it from your system.