Re: [Qemu-devel] Windows 2000 issues questions

[Troy Benjegerdes <hozer@hozed.org>]

On Mon, Apr 10, 2006 at 08:16:17PM +0400, Brad Campbell wrote:
> Hetz Ben Hamo wrote:
> >I'm sorry to bring this issues back from the dead:
> >
> >* Full disk issues
> >* Service pack issues
> >
> >I Do know that both these issues have been dealt before, but yet,
> >there is no "fix" from the QEMU application itself, compared to the
> >"competitors"..
> >
> >One thing that I don't understand is: are these issues related to DMA
> >implementation in QEMU or rather to a specific chipset implementation?
> 
> Just to back up what Leo said.. I have his %16 -win2k-hack patch installed 
> (which is required as you need to add the delay to DMA IO also) and if I 
> leave -win2k-hack enabled I find very little performance degradation.. in 
> addition to it enabling windows update to work. I'm sure it's either 
> slowing down the VM or wasting cpu cycles, but it does work and does not 
> knock things about noticeably (and I test on a PIII-M 1Ghz running at 
> 750Mhz to give kinda worst case performance testing)
> 
> I do recall not having these issues with an async-io patch installed, but 
> the last async-io patch I used changed the virtual ide controller and made 
> all my vm's useless. I'm somewhat reticent to install another patch that is 
> going to require me to re-install all my vm's.. but if there is one 
> floating about that does not change the virtual hardware and is pretty self 
> contained I'd be more than happy to run it through my test suite.

I'd be happy to test a patch that changes the virtual IDE controller to
one that works better, since I can't seem to get a win2k vm installed
and updated at all anyway ;)