Re: Dom0 with enabled ACPI doesn't recognize my IDE drives.

["Marcin M. Jessa" <lists%yazzy.org@localhost>]

On 03/26/2010 12:53 PM, Manuel Bouyer wrote:
> On Fri, Mar 26, 2010 at 12:39:43PM +0100, Marcin M. Jessa wrote:
>    
> > [...]
> > I attached dmesg output of GENERIC kernel with enabled ACPI (both
> > kernel and BIOS).
> >
> > And the main problem still remains, why can't Dom0 boot with BIOS
> > enabled ACPI..?
> >      
> Well, GENERIC with ACPI has the same problem as XEN3_DOM0 with
> ACPI: it doesn't find the viaide controller (really, it's missing
> the PCI bus the viaide controller sits on, and so is also
> missing pcib0 and amdpm0). GENERIC finds the IDE disks anyway
> through the legacy ISA interface, but then I/O to these disks
> will be slow because it doesn't use DMA or UDMA.
> XEN3_DOM0 doens't include this driver, on the assumption that
> any system capable of runing Xen/amd64 will have a PCI ide controller.
> Adding
> wdc0    at isa? port 0x1f0 irq 14 flags 0x00
> wdc1    at isa? port 0x170 irq 15 flags 0x00
> to the XEN3_DOM0 config file should make the IDE drives show up, but
> they will be slow.
>
> I think this is a bug in the ACPI tables of this machine,
> the root PCI bus is missing.
>    

That'd explain a lot. I was previously mentioning problems with speed on 
my Xen server with enabled ACPI.
So to gain reasonable performance on my IDE drives I should basically 
disable ACPI support?
Or just get rid of them and replace them with an external SATA controller .


Thanks Manuel!
Marcin