From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zachary Amsden Subject: Re: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't boot Date: Mon, 28 Feb 2011 08:51:23 -0500 Message-ID: <4D6BA85B.7080908@redhat.com> References: <4D663044.3080000@redhat.com> <20110224104800.GA29840@pcnci.linuxbox.cz> <4D663886.6080803@redhat.com> <20110224112742.GB29840@pcnci.linuxbox.cz> <4D664E85.8070808@redhat.com> <20110224124151.GK25673@pcnci.linuxbox.cz> <4D665449.4050908@redhat.com> <20110224125702.GC29840@pcnci.linuxbox.cz> <20110225104823.GD29840@pcnci.linuxbox.cz> <4D67C077.6060108@redhat.com> <20110227172052.GB2474@nik-comp.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Avi Kivity , Nikola Ciprich , KVM list , Linux kernel list To: Nikola Ciprich Return-path: In-Reply-To: <20110227172052.GB2474@nik-comp.lan> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 02/27/2011 12:20 PM, Nikola Ciprich wrote: >> I was not aware of the thread. Please cc me directly, or add a keyword >> I track - timekeeping, TSC.. >> > Hello Zachary, thanks for Your time looking at this! > >> That change alone may not bisect well; without further fixes on top of >> it, you may end up with a hang or stall, which is likely to manifest in >> a vendor-specific way. >> > I'm not sure I really understand You here, but this change is exactly to > what I got while bisecting. With later revisions, including this one, > 32bit SMP guests don't boot, before it, they do.. > Does the bug you are hitting manifest on both Intel and AMD platforms? Further, do the systems you are hitting this on have stable or unstable TSCs? Thanks, Zach