From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Steven Hand" Subject: Re: Dom0 Hang for large VCPU counts > PCPU Date: Wed, 24 Jan 2007 19:49:34 -0000 Message-ID: <07ec01c73ff0$c5e1a9b0$0302a8c0@Violet> References: Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Zulauf, John" , Keir Fraser , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org With FC6 (or any 2.6.18 kernel) there's an issue using the tsc clocksource (we're working on a fix); may not be related but could be worth booting with "clocksource=acpi_pm". cheers, S. ----- Original Message ----- From: "Zulauf, John" To: "Keir Fraser" ; Sent: Wednesday, January 24, 2007 7:28 PM Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU ________________________________________ On January 24, 2007 11:11 AM Keir Fraser [mailto:Keir.Fraser@cl.cam.ac.uk] wrote > On 24/1/07 6:56 pm, "Zulauf, John" wrote: > > > Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2 Duo > > (i.e. 2 PCPU) on a 965 chipset > > > > VCPU=17 - works > > VCPU=20 - works (takes a very long time) > > VCPU=24 - lockup (whole machine, yes I mean Dom0) > > VCPU=31 - same > > VCPU=32 - same > > Have you worked out where it gets stuck? Do many-VCPU domU guests fare > better? It IS dying for a domU guests. Do you perhaps mean PV guests? No we haven't tried them. I don't have any at the moment to test. Clarifying the initial report: Host is 2 core (Core 2 Duo/965 chipset) box with VPCU=PCPU for Dom0. Issue occurs when attempting to start an HVM DomU with VCPU >= 24 (though we haven't checked 21-23 yet). The DomU never(apparently) starts, and Dom0 hard hangs. (i.e. not even the numlock key works) Given that Dom0 hangs hard when this occurs, we don't have any ideas as to the exact cause of death. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel