The freezes are more frequent and become longer earlier during a guest session on Windows guests than on Linux/Unix guests. Guest machines running Windows XP, Windows 2000, Ubuntu, as well as OpenSolaris are all affected. The problems began right after I upgraded Ubuntu from 8.04 to 8.10, initially with VirtualBox 2.0.2 (OSE), and they persisted as I switched to the PUEL version and updated it to the 2.0.4, 2.0.6 and 2.1 releases. The only thing that helps is to disable ACPI for the guest in its advanced settings. Booting the host machine with the nohz=off option and/or inserting force_async_tsc=1 into /etc/init.d/vboxdrv, as suggested in the FAQ and in various forum posts, won't help. Only rebooting the host machine helps for a short while. Pausing and resuming, saving and restoring, or rebooting the guest, quitting and restarting VirtualBox or restarting the VirtualBox daemon make no difference at all. First there are only the slightest of delays, but within half an hour or so it becomes impossible to do anything inside the guest. This behavior becomes the more pronounced the longer the guest machine has been running. The host machine is not affected and remains responsive all the time. Shortly after that, the guest will freeze again, and so on and so forth. will run in an accelerated, jumpy way during this catch-up phase, which lasts for about two to four seconds.
When the guest becomes responsive again after a few seconds, it looks like it's trying to make good for the time lost by running faster for a few moments. No input is possible, and the display isn't being updated so that things like animated cursors or the hands of analog clocks won't move. I can move the mouse pointer while the guest is in its frozen state, but otherwise everything comes to a standstill. Guest machines with any operating system and ACPI enabled are practically unusable because, after running for some time, they will begin to freeze temporarily every few seconds. I have a MacBook 4,1, running Ubuntu 8.10 Intrepid Ibex (amd64) and VirtualBox 2.1 (PUEL).
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