Avi,
Sure -- you can download a tarball of kvm_stat logfiles from:
http://misc.cyclecounters.org/qemu-logs.tgz
I ran three workloads (a short, medium, and long) against both
0.11.1 and 0.12.3. Each workload was started with:
time ~/qemu-0.12.3/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-9.10/0008.img
(or ~/qemu-0.11.1/bin/... and the same options.)
For the "short" workload, I just shut down the Ubuntu guest immediately
after
it finishes logging me in.
For the "medium" workload, I open up an 80x43 terminal window in the guest,
and execute:
yes 1234567890123456789012345678901234567890 | head -n 10000
before shutting down the guest. For the "long" workload, I open up the
same terminal window and execute:
yes 1234567890123456789012345678901234567890 | head -n 100000
before shutting down the guest.
When running these workloads under 0.12.3, you can watch the screen redraw;
it takes 1 or 2 seconds just to put up the desktop background after the
splash screen.
Top shows the `VKoala' process as pegging one or more cpus, while the host's
X server is essentially idle (< 5% of a cpu).
When running these workloads under 0.11.1, the screen redraw is too fast to
notice -- it appears to just "blink" up instantly. Top shows the `VKoala'
process as pegging one or more cpus during boot. When the terminal is busy,
top shows `VKoala' and the host's X server both using ~60% of a cpu --
so the
guest is probably being somewhat limited by the host's wimpy graphics.
Hope this is the info you needed. Thanks for your help! Aloha,
Adam
Avi Kivity wrote:
On 04/28/2010 10:33 PM, Adam Greenblatt wrote:
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.
Please post kvm_stat output for the fast and slow cases (preferably
running the same workload, perhaps a web page displaying an animation).
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