I have (portable) Virtualbox installed on a USB key running on a 64-bit Windows 7 host. I installed 32 bit Ubuntu 10.04 as a guest OS.
During spikes in processor usage on the guest OS (based on looking at top), the Ubuntu virtual box freezes up for 5-10 seconds. The guest becomes unresponsive with the VirtualBox window showing as "not responding". There seems to maybe be a correlation between this behavior and network accesses.
I've experimented with the number of CPUs allocated to the virtual box, added and removed RAM, and adding video memory -- all to no avail. I have not attempted disabling or changing the processor level virtualization (VT-x).
I'm wondering if there's anything particular about Ubuntu 10.4 that might be impacting this? Should I have installed 64-bit Ubuntu (or should it matter!?). Is there a VirtualBox setting I'm missing that would improve my experience?
Any help is appreciated.