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Ticket Resolution Summary Owner Reporter
#6583 obsolete Contention for host CPU can trigger high host CPU usage for idle Guest Adam Tilghman
Description

Environment:

Host: CentOS 5.4 (1.8Ghz P4 non-VMX CPU; kernel: redhat 2.6.18-164.15.1.el5)

Guest: CentOS 5.4 (kernel: 2.6.18-164.15.1.el5)

The guest's tick rate is set to 100hz (verified via "getconf CLK_TCK" on guest). VBox USB is disabled. The guest is configured to be completely idle after boot: after startup,the only non-kernel processes running are "udev" and "sshd".

Description:

Once the guest finishes bootup, its CPU sits idle, and as expected, "VBoxHeadless" consumes less than 10% of the host CPU.

After some time, however, VBoxHeadless CPU usage jumps to ~50% and permanently remains at that level, even though from the guest's perspective the CPU remains idle. (See attached graph of host CPU usage).

When starting the guest VM 'nice +20', I can trigger the unexpected behavior simply by loading down the host CPU with other work.

Without the 'nice', a SIGSTOP/sleep 60/SIGCONT on the VM process will also cause the permanent jump in CPU usage.

The VBox.log entries show a missed timer catch-up at precisely the point where CPU usage jumps higher. I wonder if the high CPU usage is due to a bug in the VBox timer emulation code?

I can provide a shell login on the host and guest to interested developers, and I'm happy to supply the guest VM files if desired.

#3968 duplicate Context: "Compact(progress.asOutParam())" at line 465 of file VBoxManageDisk.cpp mgruys
Description

After executing: VBoxManage modifyvdi Windows.vdi compact

The following error occurred: Context: "Compact(progress.asOutParam())" at line 465 of file VBoxManageDisk.cpp ERROR: code NS_ERROR_ABORT (0x80004004) - Operation aborted (extended info not available)

#5517 obsolete Continuing keypress freezes WindowsXp Guest Karsten Steingaß
Description

If I press a key for a longer time (a few seconds) the guest freezes until I release that key. This happens not only in games but also in normal applications.

Take a notepad, press a key and move the mouse, after a few seconds the mouse pointer won't move anymore and the character isn't added to the notepad anymore. As soon as I release the key, everything is normal again.

Thank you for your great work!

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