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Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2

From: Alexander Graf
Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?
Date: Wed, 4 Aug 2010 20:18:39 +0200

On 04.08.2010, at 20:16, Anthony Liguori wrote:

> On 08/04/2010 01:13 PM, Alexander Graf wrote:
>> On 04.08.2010, at 19:46, Richard W.M. Jones wrote:
>>> On Wed, Aug 04, 2010 at 07:36:04PM +0300, Avi Kivity wrote:
>>>> This is basically my suggestion to libguestfs: instead of generating
>>>> an initrd, generate a bootable cdrom, and boot from that.  The
>>>> result is faster and has a smaller memory footprint.  Everyone wins.
>>> We had some discussion of this upstream&  decided to do this.  It
>>> should save the time it takes for the guest kernel to unpack the
>>> initrd, so maybe another second off boot time, which could bring us
>>> ever closer to the "golden" 5 second boot target.
>>> It's not trivial mind you, and won't happen straightaway.  Part of it
>>> is that it requires reworking the appliance builder (a matter of just
>>> coding really).  The less trivial part is that we have to 'hide' the
>>> CD device throughout the publically available interfaces.  Then of
>>> course, a lot of testing.
>> Why not go with 9p? That would save off even more time, as you don't have to 
>> generate an iso. You could just copy all the relevant executables into tmpfs 
>> and boot from there using your kernel and a very small (pre-built) initrd.
> You can't boot from 9p.

But you could still use -kernel and -initrd for that, no?


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