Re: [Qemu-devel] [PATCH 0/2] mac-io IDE DB-DMA support

[Laurent Vivier]

Le 30 janv. 09 à 21:39, Aurelien Jarno a écrit :

> On Thu, Jan 29, 2009 at 09:25:18PM +0100, Laurent Vivier wrote:
> > This series of patch allows to use powermac mac-io IDE interface by
> > implementing
> > DB-DMA. Linux 2.6.18 seems to not be able to use correctly mac-io IDE
> > interface
> > without DMA.
> >
> > [PATCH 1/2] mac-io DB-DMA support
> > [PATCH 2/2] IDE DB-DMA support
>
> Thanks a lot for your work. I have tried it, but I have a few problems
> with it. I tried with OpenBIOS revision 431.
>
> With a 2.6.18 kernel (Debian Etch), it works without problem, I get a
> about 13MB/s, compared to 1.5MB/s without DMA and about 21MB/s with  
> the
> CMD646.
>
> With the 2.6.26 kernel (Debian Lenny), I get 1.2MB/S only. Moreover,
> trying an installation with a CD-ROM, the VM freeze while loading udeb
> packages. Note that the DMA is correctly detected and actived.
>
> Given that those patches really improve the support for the mac-io  
> IDE,
> I have merged them with one minor change to the first one
> (s/conditionnal/conditional/g).

Thank you,

I'm working on new version using asynchronous I/O and  
cpu_physical_memory_map(). It should improve performance.

Regards,
Laurent