On Sunday 22 April 2007 11:25:21 Avi Kivity wrote:
> Andrew Walrond wrote:
> > On all kvm versions I have tried (16 - 19) running windows XP, with the
> > XP window having captured the mouse, I have to make my mouse clicks slow
> > and deliberate else XP does notice them. It makes double clicks
> > especially hard.
> >
> > I am running Kubuntu Feisty 64bit on a core 2 duo dell laptop, and the
> > external kvm modules.
> >
> > Hope that's useful. Let me know if I can provide further information.
>
> What's your host cpu type?
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz
stepping : 6
The cpu frequency control is set to Dynamic, and both cores seems to run at
half speed (1GHz) most of the time, incase that makes a difference.
>
> Are you running as root or as a regular user?
As root. Here is the little script I use to start VMs:
#!/bin/sh
sudo modprobe kvm-intel
sudo bash -c 'echo 1024 > /proc/sys/dev/rtc/max-user-freq'
sudo qemu-system-x86_64 -m 512 -daemonize -hda $1
>
> Does time flow normally in the guest (watch the Windows clock)
>
After a couple of hours uptime, the kubuntu/XP clocks match exactly. (Well,
exactly 1 hour out, but I guess thats because I'm on BST which is being
propagated to the VM as the hardware clock time; A minor issue for another
day)
> What's the kernel version? What's CONFIG_HZ set to?
Latest Feisty kernel but using kvm-19 modules
No idea about CONFIG_HZ. The Kubuntu kernel doesn't seem to expose the .config
in /proc. Any other way I can find out?
$ uname -a
Linux andrew-xps 2.6.20-15-generic #2 SMP Sun Apr 15 06:17:24 UTC 2007 x86_64
GNU/Linux
>
> If you run the guest with 'taskset 1', does the problem go away? (e.g.
> taskset 1 qemu ...)
>
Modified my script above to do
sudo taskset 1 qemu-system-x86_64 -m 512 -daemonize -hda $1
but no improvement I'm afraid
> If you run with -no-kvm, does the problem go away?
No, still there.
> Anything in dmesg?
Ah... A load of these
[ 3949.793179] rtc: lost some interrupts at 1024Hz.
[ 3949.813162] rtc: lost some interrupts at 1024Hz.
[ 3949.833150] rtc: lost some interrupts at 1024Hz.
[ 3949.853139] rtc: lost some interrupts at 1024Hz.
[ 3949.873130] rtc: lost some interrupts at 1024Hz.
[ 3949.893117] rtc: lost some interrupts at 1024Hz.
[ 3949.913108] rtc: lost some interrupts at 1024Hz.
Which I guess might just be the problem?
I only added the
sudo bash -c 'echo 1024 > /proc/sys/dev/rtc/max-user-freq'
line to my script because qemu-system-x86_64 told me to. Should I try removing
it?
Andrew Walrond
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