Hi,
I noticed that certain guests (for example, Ubuntu 9.04, Ubuntu 9.10,
and the Ubuntu 10.04 release candidate) show dramatically (~100x) slower
graphical output when running under qemu-kvm-0.12.1.1 than under
qemu-kvm-0.11.1.
Other guests, notably Windows XP and Windows Vista, run fine under both
version of qemu. The regression is still present in qemu-kvm-0.12.3.
Here's the information you request when submitting a bug report:
* what cpu model (examples: Intel Core Duo, Intel Core 2 Duo, AMD
Opteron 2210)
The host has two Xeon X5650 cpus.
* what kvm version you are using. If you're using git directly,
provide the output of 'git describe'.
I'm using the kvm included with the stock 2.6.32.12 kernel, and
two different
qemu-kvms: version 0.11.1, which works fine, and version
0.12.1.1, which has
the regression.
* the host kernel version
I'm running kernel 2.6.32.12 on the host.
* what host kernel arch you are using (i386 or x86_64)
i386.
* what guest you are using, including OS type (Linux, Windows,
Solaris, etc.), bitness (32 or 64), kernel version
Guests that are affected:
Ubuntu 9.04 - kernel 2.6.28-18, 32 bits
Ubuntu 9.10 - kernel 2.6.31-20, 32 bits
Ubuntu 10.04 - kernel 2.6.32-21, 32-bits
Guests that aren't affected:
Windows XP SP3, Windows Vista SP2: both 32 bits
* the qemu command line you are using to start the guest
Here's one that works:
DISPLAY=:0.2 ~/qemu0111/bin/qemu-system-x86_64 -m 1536 -soundhw es1370
-smp 4 -usb -usbdevice tablet -vga std -cpu core2duo -snapshot -name
"VKoala (r/o)",process="VKoala" -net nic,macaddr=DE:AD:BE:EF:00:08 -net
tap,vlan=0,ifname=tap6,script=no,downscript=no /vm/ubuntu-9.10/0006.img
Here's one that works, but has drastically slower graphics (the only
change is which qemu-system-x86_64 I'm running.)
DISPLAY=:0.2 ~/qemu01211/bin/qemu-system-x86_64 -m 1536 -soundhw es1370
-smp 4 -usb -usbdevice tablet -vga std -cpu core2duo -snapshot -name
"VKoala (r/o)",process="VKoala" -net nic,macaddr=DE:AD:BE:EF:00:08 -net
tap,vlan=0,ifname=tap6,script=no,downscript=no /vm/ubuntu-9.10/0006.img
Here are two that work fine with either binary:
DISPLAY=:0.2 ~/qemu01211/bin/qemu-system-x86_64 -m 1536 -soundhw es1370
-usb -usbdevice tablet -localtime -vga std -cpu core2duo -snapshot -name
"VXP (r/o)",process="VXP" -net nic,macaddr=DE:AD:BE:EF:00:01 -net
tap,vlan=0,ifname=tap0,script=no,downscript=no /vm/xp/0024.img
DISPLAY=:0.2 ~/qemu01211/bin/qemu-system-x86_64 -m 1536 -soundhw es1370
-smp 2 -usb -usbdevice tablet -localtime -vga std -cpu core2duo
-snapshot -name "VVista (r/o)",process="VVista" -net
nic,macaddr=DE:AD:BE:EF:00:02 -net
tap,vlan=0,ifname=tap1,script=no,downscript=no /vm/vista/0009.img
* whether the problem goes away if using the -no-kvm-irqchip or
-no-kvm-pit switch.
Neither of these switches change the results.
* whether the problem also appears with the -no-kvm switch.
This switch makes everything run so much slower that I can't tell
if it
changes the results.
Please cc me if you have any questions, as I'm not subscribed to the kvm
list.
Thanks for working on kvm, it's a great piece of software! Aloha,
Adam Greenblatt
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