Re: frequent guest lockup (and mouse/keyboard problems)

[Leonard Norrgard <leonard.norrgard-g2GXA8XeJSExHbG02/KK1g@public.gmane.org>]

Dor Laor wrote:
> Finally I manage to reproduce the problem. I did manage to play the
> puzzle without problems, but I discovered that under load there are
> problems with the mouse.
> I didn't have any problems with 100% cpu consumption (Operton cpu).
>   
I'll try to find a good way to reproduce the 100% cpu problem. I have a
feeling it may be network related (could be a qemu 0.8.2 bug, even).
> I believe the mouse problems are caused by using the relative mouse
> coordinates. So when the host is loaded there is latency between the
> host reading and the guest irq injection.
>   
Perhaps, but his wouldn't explain why the mouse buttons are randomly
clicked. It seems that this often happens at the very same time as the
pointer jumps somewhere.
> Can you try using usbtablet mouse? (Note that you'll need to install
> evtoucher driver).
>   
No trouble at all with -usbdevice tablet (Btw, new debian supporting
package coming up to enable this for linux guests, did the basic work on
it in order to do this test), except that the pointer doesn't move
smoothly when the guest is run in kvm. Using qemu 0.9.0 + kqemu (GPL:d
now!), the pointer moves very smoothly with -usbdevice tablet - it's in
fact difficult to distinguish from native. (There are also no mouse
problems when running the guest with kvm -no-kvm).

The keyboard problems are very easy to reproduce here. Just open a text
editor in the guest and try to edit something. Move around in the text,
make edits. A key will get stuck very quickly, causing auto-repeat.

In fact, keys get stuck so often in the guest, that I've installed the
Debian KDE package named kbstate. After installation, right click on the
bottom panel and select "Add applet to panel...", then add the applet
named "Keyboard Status Applet". This gives a visual indicator as to
which key is stuck right now.


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