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

From: Leonardo E. Reiter
Subject: Re: [Qemu-devel] [PATCH] -win2k-hack performance+DMA support
Date: Thu, 09 Feb 2006 13:35:48 -0600
User-agent: Debian Thunderbird 1.0.2 (X11/20051002)

No problem... hopefully Fabrice will apply this patch to CVS soon. We've been testing/deploying this mechanism (every 16th interrupt) with Win4Lin Pro for a long time now with no disk full problems, so I can vouch that it's reliable (and quite fast compared to delaying on *every* interrupt). As for the DMA reintroducing the problem, that's understandable since Fabrice didn't originally implement the win2k_install_hack check for the DMA callback in hw/ide.c. It was a moot point since DMA didn't work with Windows 2000 anyway in QEMU CVS until very recently, but since it does now, it will cause problems unless it handles -win2k-hack as well.

- Leo Reiter

Brad Campbell wrote:
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 :)


Leonardo E. Reiter
Vice President of Product Development, CTO

Win4Lin, Inc.
Virtual Computing from Desktop to Data Center
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Fax: +1 512 532 6501

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