Re: [Qemu-devel] [PATCH] -win2k-hack performance+DMA support

[Troy Benjegerdes]

On Thu, Feb 09, 2006 at 06:03:53PM +0400, Brad Campbell wrote:
> Leonardo E. Reiter wrote:
> >Attached is a patch which greatly speeds up disk writes when using 
> >-win2k-hack to install Windows 2000.  It only delays every 16th 
> >interrupt, which after rigorous testing is still enough to overcome the 
> >"Windows 2000 disk full" bug.  If you are really adventurous you can try 
> >it every 32nd time, but for me that caused problems during some 
> >installations, so I thought it was too aggressive.
> >
> >This patch also adds -win2k-hack functionality to DMA writes, since DMA 
> >now works in the latest CVS QEMU.
> >
> 
> Using todays CVS, and kqemu in user mode only I tried to install Win2k-SP4 
> 25 times all with disk full errors until I applied this patch.
> It would appear the installer will use DMA mode if it's available and 
> therefore the existing win2k-hack does not work.
> 
> Using this patch 5 out of 5 installs worked perfectly.
> 
> Thanks Leo :)
> 
> Regards,
> Brad

with current CVS, I am unable to install win2k.. This patch appears to
be needed for win2k installs to work.

With this patch, I am able to install w2k with user-kqemu.