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I don't want to keep unnecessarily bsoding my machine, but it seems that even with io apic turned off Windows 7 bsods. I'm running Windows 7 64-bit on an amd turion ql-62. Haven't tried vbox with amd-v off, but really, I don't see why I should get a BSOD. It keeps saying something about the timer and the second processor taking too long to respond. Nested paging is also enabled. Running ubuntu 64 as a guest. Is there something incompatible with the turions and your implementation of acpi? Even if I run this as single processor with amd-v and apci on I get a bsod. I don't know if nested paging could be causinsg problems, but I don't see how it would. It ony acltivates if the processor supports it AFAIK. I was all excited about the multiprocessor capability of v3 too.

Compiz worked though.

Thanks

Just thought I'd update. I'm using virtual box 3.06 and have successfully installed ubuntu 9.04. Seamless seems to be working well, but regardless of what window mode I use, 3d acceleration seems to have taken a huge hit compared to the last time I tried version 3. (3.04 I think) Before it was smooth and now it seems very sluggish, approaching like 1fps. This machine has a nvidia 9100m, and I believe that I'm running the latest drivers. 185.xxx series. I think the BSOD was certainly some driver issue originally. Once I found good drivers for this machine everything stabilized. On the QL-62 VT works but nested paging does not. Multi-core works, but to be honest, it seems to manage better on a single core. The processor is dual core, so, to me it makes sense to at least leave a core free for the host, but it does work and seems to load balance ok, just not as responsively as a single core, so I have IO APIC disabled which seems to be a big performance hit. Generally outside of sluggish hard drive access.....(my virtual partition is probably heavily fragmented to boot) the guest seems nice and responsive. Seamless is fast enough that dragging windows across the desktop does not create all kinds of artifacts that it did on older computers for me. Very nice indeed. Its like having the best of both worlds. CPU usage is about 6-8% at idle. I never realized until I had a VT enabled processor how powerful a virtual machine can truly be. This is a game changer for someone like me who hates to dual boot but doesn't like the sluggishness of a traditional virtual machine.

Thanks to the vbox team for making this better and better!