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Date: Tue, 12 Jun 2012 11:44:07 -0700
From: Chegu Vinod <chegu_vinod@hp.com>
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Subject: Re: [Qemu-devel] Large sized guest taking for ever to boot...
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To: Gleb Natapov <gleb@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, Alex Williamson <alex.williamson@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>

On 6/12/2012 8:39 AM, Gleb Natapov wrote:
> On Tue, Jun 12, 2012 at 08:33:59AM -0700, Chegu Vinod wrote:
>> I rebuilt the 3.4.1 kernel in the guest from scratch and retried my
>> experiments and measured
>> the boot times...
>>
>> a) Host :  RHEL6.3 RC1 + qemu-kvm (that came with it)&   Guest :
>> RHEL6.3 RC1:  ~1 min
>>
>> b) Host :3.4.1 + qemu-kvm.git&  Guest : RHEL6.3RC1      -   ~1 min
>>
>> c) Host :3.4.1 + qemu-kvm.git&  Guest : 3.4.1      -   ~10 mins
>>
>> d) Host :3.4.1 + qemu.git&  Guest : RHEL6.3 RC1  -    ~1 min
>>
>> e) Host :3.4.1 + qemu.git&  Guest : 3.4.1                   -    ~14 mins
>>
>>
>> In both the case (c)&  (e) had quite a few warning/error messages
>> from udevd.
>>
>> FYI..
>> Vinod
>> PS:  Haven't had the time to do any further analysis...as the
>> machine is being used for
>> other experiments...
>>
>>
> Next time you get the machine can you try running (b) but adding
> -hypervisor to your -cpu config.

I tried that and didn't make any difference...i.e. the RHEL6.3 RC1 guest 
booted in about ~1 min.

Vinod
>
> --
> 			Gleb.
>