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Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? |
Date: |
Wed, 4 Aug 2010 14:22:29 +0100 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
On Wed, Aug 04, 2010 at 04:07:09PM +0300, Gleb Natapov wrote:
> On Wed, Aug 04, 2010 at 08:04:09AM -0500, Anthony Liguori wrote:
> > On 08/04/2010 03:17 AM, Avi Kivity wrote:
> > >For playing games, there are three options:
> > >- existing fwcfg
> > >- fwcfg+dma
> > >- put roms in 4GB-2MB (or whatever we decide the flash size is)
> > >and have the BIOS copy them
> > >
> > >Existing fwcfg is the least amount of work and probably
> > >satisfactory for isapc. fwcfg+dma is IMO going off a tangent.
> > >High memory flash is the most hardware-like solution, pretty easy
> > >from a qemu point of view but requires more work.
> >
> > The only trouble I see is that high memory isn't always available.
> > If it's a 32-bit PC and you've exhausted RAM space, then you're only
> > left with the PCI hole and it's not clear to me if you can really
> > pull out 100mb of space there as an option ROM without breaking
> > something.
> >
> We can map it on demand. Guest tells qemu to map rom "A" to address X by
> writing into some io port. Guest copies rom. Guest tells qemu to unmap
> it. Better then DMA interface IMHO.
I think this is a fine idea. Do you want me to try to implement
something like this? (I'm on holiday this week and next week at
the KVM Forum, so it won't be for a while ...)
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
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http://et.redhat.com/~rjones/virt-df/
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, (continued)
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Alexander Graf, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Alexander Graf, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?,
Richard W.M. Jones <=
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Gleb Natapov, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Gleb Natapov, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Richard W.M. Jones, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Gleb Natapov, 2010/08/04