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

From: Brad Campbell
Subject: Re: [Qemu-devel] [PATCH] -win2k-hack performance+DMA support
Date: Thu, 09 Feb 2006 18:03:53 +0400
User-agent: Thunderbird 1.6a1 (X11/20060129)

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 :)

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