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

From: Laurent Vivier
Subject: Re: [Qemu-devel] [PATCH 0/2] mac-io IDE DB-DMA support
Date: Fri, 30 Jan 2009 21:46:16 +0100

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
DB-DMA. Linux 2.6.18 seems to not be able to use correctly mac-io IDE
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

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

Thank you,

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


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