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Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ? |
Date: |
Fri, 14 Sep 2012 14:24:57 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Sep 14, 2012 at 02:03:58PM +0400, Michael Tokarev wrote:
> On 14.09.2012 14:00, Jan Kiszka wrote:
> []
> > The major difference in qemu-system-i386 vs. qemu-system-x86_64 is on
> > the TCG side: We measured noticeable performance benefits when running
> > 32/16 bit OSes against qemu-system-i386 vs. using qemu-system-x86_64. I
> > don't have numbers at hand, but colleagues decided to use the 32-bit
> > version for that reason (when no KVM is available).
>
> Interesting. Maybe someone should look at the difference on TCG side
> and merge interesting bits from i386 to x86_64... :)
Most of the code between i386 and x86_64 is basically the same. For
improving TCG performances, the only interesting thing to merge from i386 to
x86_64 would be the use 32-bit registers instead of 64-bit registers. Oh
wait...
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
- [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Michael Tokarev, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Daniel P. Berrange, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Michael Tokarev, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Jan Kiszka, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Michael Tokarev, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Jan Kiszka, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Daniel P. Berrange, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Jan Kiszka, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Peter Maydell, 2012/09/14
- Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?,
Aurelien Jarno <=
Re: [Qemu-devel] qemu-system-i386 vs qemu-system-x86_64 ?, Blue Swirl, 2012/09/14