From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't boot Date: Thu, 24 Feb 2011 14:26:45 +0200 Message-ID: <4D664E85.8070808@redhat.com> References: <20110223234258.GA29548@nik-comp.lan> <4D663044.3080000@redhat.com> <20110224104800.GA29840@pcnci.linuxbox.cz> <4D663886.6080803@redhat.com> <20110224112742.GB29840@pcnci.linuxbox.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: KVM list , Linux kernel list , nikola.ciprich@linuxbox.cz To: Nikola Ciprich Return-path: In-Reply-To: <20110224112742.GB29840@pcnci.linuxbox.cz> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 02/24/2011 01:27 PM, Nikola Ciprich wrote: > > Not very useful when the guest is making progress, I'm afraid. > can perf report help here? > > > Can you try a little trace-cmd -e kvm -b 20000? > ugh, I'm afraid I'll have some dumb questions here :-[ > You mean this: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git ? Yes. If you have udis86 and udis86-devel installed when building it, it's even better. > and then re-execute qemu-kvm using it? or I'm totally wrong? You don't have to execute qemu-kvm under it, if you have a running instance you can run trace-cmd in parallel and it will record whatever's happening. > > Sure. Something similar that came up - sometimes Windows IDE drivers > > fall back to PIO mode. Are you using IDE? If so, please check whether > > it's using DMA or PIO. > I'll check, but this problem occurs only during fsck phase, when to guest boots, then it runs pretty fast.. > so maybe during boot it might fall back to PIO, but from guest, I guess I won't have a chance > to find out.. can I somehow check it from host? The trace-cmd output will show. Please run trace-cmd report afterwards and post the results somewhere. -- error compiling committee.c: too many arguments to function