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Ticket Resolution Summary Owner Reporter
#2526 fixed Non-uniform internal timer in guest OS Konstantin Vlasov
Description

Host machine: Core 2 Duo 6600, 2 GB RAM.
Host OS: WinXP SP3
Guest OS: SUSE Linux Enterprise Server 10 SP2
GA installed

Partially the problem is mentioned in the forum threads:
http://forums.virtualbox.org/viewtopic.php?t=10396
http://forums.virtualbox.org/viewtopic.php?t=1335
and probably here:
http://forums.virtualbox.org/viewtopic.php?t=10745

However, I could find some more details which may be of use for reproducing and fixing the problem.


Problem description

The internal timer inside VM sometimes runs non-uniformly. It looks like following:

  1. At first the guest OS looks somewhat slow in every aspect (including system clock which shows seconds passing more slowly than on the host clock). So, as time passes, the guest clock become more and more mistimed with the host one.
  2. Then suddenly the virtual machine starts to catch up the host clock: guest OS works much faster than before, keyboard delays are extremely low (so when I try to type e.g. "grep", I get something like "ggggggrrrrrreeeeeppppp"), the guest clock are running very fast (several seconds pass within only one "host second").
  3. When guest timer equals to the host one, the speed returns back to normal, then again slows down, and then speeds up, and so on.

Lengths of the periods described can be different. Sometimes, it is slow for couple of minutes, then fast for 7-10 seconds; sometimes it's slow for several seconds, then fast for 0,5-1 second.

Additional factors

I wanted to record a video with this behaviour. However, each time I run video recorder (I'm using UVScreenCamera), the problem became unreproducable. Finally, I noticed that UVScreenCamera's recording process performs something that forces VirtualBox's guest clock catch up the host clock. And the more frames per second I set in the recorder's options, the more smoothly runs VirtualBox. So, it seems that each additional redraw operation (or something like that) makes VB forcibly perform that "catch up" operation, which otherwise would be delayed for the future.

#2548 fixed Saved state is discarded after VERR_NO_MEMORY Konstantin Vlasov
Description

Host OS: WinXP SP3 Guest OS: any

I tried to load a VM which was in saved state, but there was not enough memory on my host machine (many programs loaded), so I got VERR_NO_MEMORY. After that the saved state of this VM silently disappeared: in VB Manager it was shown in "Powered Off" state, and when I tried to open it again, it started loading from scratch, as if I discarded the saved state (which of course I did not). Log file of this VM is attached.

#3658 fixed Host Interface networking hangs VB Konstantin Vlasov
Description

Host OS: Vista Business 32-bit Guest OS: openSUSE 11.1 32-bit

If I set Host Interface networking for the VM and start using this connection intensively, first guest OS hangs completely, and when I try to do anything with it via VirtualBox GUI (reset it, or close with saving state), the VB itself hangs too. The only thing I can do after that is to kill VB process.

I already reported this bug for 2.2.0 beta 2, but the beta-test forum is killed, and the bug is still present in 2.2.0 final. :-(

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