On 05/01/2010 10:17 PM, Adam Greenblatt wrote:
Avi,
Sure -- you can download a tarball of kvm_stat logfiles from:
Please don't top-post.
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.
Anthony, can this be due to the SDL changes doing bitblt using X?
Looks like this regresses not only for remote displays, but also for
local ones.
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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