RE: [Xen-devel] Building firmware on NetBSD

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Pierrick Brossin
> Sent: 03 October 2006 15:26
> To: Petersson, Mats
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Building firmware on NetBSD
> 
> On Tue, Oct 03, 2006 at 04:20:09PM +0200, Petersson, Mats wrote:
> > Depends on what you're doing, generally the modified will 
> win - but in
> > some cases it's hard to get the source-code to modify [or 
> find someone
> > that is ABLE to modify it for that matter]. 
> 
> What I mean is. In what way running an unmodified os with xen 
> is better
> than running it directly in qemu ?

It's "different", and faster than qemu, for sure - if it's not, then
something is wrong with Xen... Qemu emulates instructions, Xen fully
virt guests only have certain instructions emulated in Xen. It uses qemu
to perform hardware accesses, such as hard-disk interface and network
card, but not for the instructions that are executed in the guest. 
> 
> Is it faster ? Is it completely different ?

Should be faster, as long as you don't spend 100% of the time doing disk
or network accesses [in which case the difference is probably in QEMU's
favour - but difference would be small anyways, as most of the time is
spent simulating the IO access, and little time actually performing some
"real" work]. 

--
Mats
> 
> 
> Thanks again for your time
> 
> 
> -Pierrick Brossin
> 
> 
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> 



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