From: Anthony Wright <anthony@overnetdata.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: VM hangs during boot on 3.0.4 dom0 kernel, works on alternative hardware
Date: Tue, 13 Sep 2011 10:52:40 +0100 (BST) [thread overview]
Message-ID: <8813601.2.1315907560404.JavaMail.root@zimbra.overnetdata.com> (raw)
In-Reply-To: <4E6BCDA9.3030700@overnetdata.com>
----- Original Message -----
> On 06/09/2011 17:16, Konrad Rzeszutek Wilk wrote:
> > On Mon, Sep 05, 2011 at 11:31:16AM +0100, Anthony Wright wrote:
> >> I have two machines with identical Dom0's and DomUs, but different
> >> hardware. The Dom0 has a patch which I produced myself based on the
> >> "Re:
> >> [Xen-devel] Kernel bug from 3.0 (was phy disks and vifs timing out
> >> in
> >> DomU)" thread. The patch calls vmalloc_sync_all after every
> >> alloc_vm_area, and I realise this isn't the best solution, but it
> >> allowed me to move forward.
> > <nods>
> >> The patch fixes the problem I had on one machine, so that now the
> >> VMs
> >> boot correctly, but I have another system with an identical setup
> >> (identical Dom0 & DomU kernels, identical startup for DomU) and the
> >> VM
> >> fails to start. I have attached a copy of the console log from the
> >> good
> >> VM and the bad VM.
> > And what does the dom0 and xen hypervisor log give you?
> >
> > It looks to be hanging at identifying the CPU - is the hardware
> > quite different from one setup to another? Have you toyed with
> > using the cpuid flag in the guest to mimic the lowest CPU type?
> I've found a solution to my problem. The PV DomU was running a 32 bit
> linux kernel version 2.6.30.1. I hoped that a new kernel would be able
> to handle to CPU more effectively, and so I upgraded my DomU kernel to
> 3.0.4, and now the DomU boots.
>
> This solves the problem for me, but I'm slightly concerned that my
> original kernel wouldn't work with this CPU (the CPU type for the
> kernel
> builds is set to Pentium Pro). I'll try the 2.6.30.1 kernel on bare
> metal on monday to try to see if this is a xen/Dom0 kernel issue or a
> CPU/DomU issue.
>
> Anthony
I've tried the 2.6.30.1 kernel on bare metal and it boots correctly, so it looks like some xen/Dom0 interaction is causing it to fail when run as a DomU. I have a work around (upgrading to 3.0.4 kernel), so it's not affecting me but I'm happy to do any diagnostics to help identify the cause of the problem.
next prev parent reply other threads:[~2011-09-13 9:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-05 10:31 VM hangs during boot on 3.0.4 dom0 kernel, works on alternative hardware Anthony Wright
2011-09-06 16:16 ` Konrad Rzeszutek Wilk
2011-09-07 12:29 ` Anthony Wright
2011-09-10 20:50 ` Anthony Wright
2011-09-13 9:52 ` Anthony Wright [this message]
2011-09-14 22:28 ` Konrad Rzeszutek Wilk
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