Hello Alkis, or anyone else affected,

Accepted metacity into xenial-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/metacity/1:3.18.4-0ubuntu0.1 in a
few hours, and then in the -proposed repository.
Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Also affects: metacity (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: metacity (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: metacity (Ubuntu Xenial)
       Status: New => Fix Committed

** Tags added: verification-needed

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to metacity in Ubuntu.
https://bugs.launchpad.net/bugs/1566157

Title:
  Metacity's compositing is too slow

Status in metacity package in Ubuntu:
  New
Status in metacity source package in Xenial:
  Fix Committed
Status in metacity source package in Yakkety:
  New

Bug description:
  [Impact]
  Metacity's performance is about 2 times slower than it was in 14.04 version. 
It is a regression from previous LTS and impacts users with slow hardware.

  [Test Case]
  Run some performance checker like x11perf or glmark2, see the reporter's 
comments below for detailed info.

  [Regression Potential]
  This fix is tested by several users and seems to not have any regressions.

  -----------------------------------------------------------------------------
  I did the following benchmarks between `metacity --no-composite`, `metacity 
--composite`, and `compiz`, in Ubuntu 16.04.

  First, I disabled vsync:
  $ cat ~/.drirc
  <device screen="0" driver="dri2">
      <application name="Default">
              <option name="vblank_mode" value="0"/>
      </application>
  </device>

  Then I ran glxgears as follows:

  $ metacity --no-composite --replace & sleep 5 && glxgears & sleep 20 && 
killall glxgears
  29564 frames in 5.0 seconds = 5912.721 FPS
  29729 frames in 5.0 seconds = 5945.777 FPS

  $ metacity --composite --replace & sleep 5 && glxgears & sleep 20 && killall 
glxgears
  10366 frames in 5.0 seconds = 2073.057 FPS
  10194 frames in 5.0 seconds = 2038.702 FPS

  $ compiz --replace & sleep 5 && glxgears & sleep 20 && killall glxgears
  37633 frames in 5.0 seconds = 7522.813 FPS
  37990 frames in 5.0 seconds = 7597.965 FPS

  As a second set of benchmarks, I ran glxgears -fullscreen as follows:

  $ metacity --no-composite --replace & sleep 5 && glxgears -fullscreen & sleep 
20 && killall glxgears
  1652 frames in 5.0 seconds = 330.296 FPS
  1667 frames in 5.0 seconds = 333.281 FPS

  $ metacity --composite --replace & sleep 5 && glxgears -fullscreen & sleep 20 
&& killall glxgears
  886 frames in 5.0 seconds = 177.007 FPS
  891 frames in 5.0 seconds = 178.099 FPS

  $ compiz --replace & sleep 5 && glxgears -fullscreen & sleep 20 && killall 
glxgears
  1830 frames in 5.0 seconds = 365.868 FPS
  1847 frames in 5.0 seconds = 369.242 FPS

  Normalized results (with compiz=100):
  ================================
  Windowed:
  metacity --no-composite: 78 FPS
  metacity --composite: 27 FPS
  compiz: 100 FPS

  Full screen:
  metacity --no-composite: 90 FPS
  metacity --composite: 48 FPS
  compiz: 100 FPS

  So `metacity --composite` in this test was about 2 times slower than
  `metacity --no-composite` and about 3 times slower than `compiz`.

  This test was done an "Intel(R) Core(TM) i5-4440 CPU @ 3.10GHz" CPU, with the 
following embedded graphics card:
  $ lspci -nn -k | grep -A 2 VGA
  00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 
v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)
   Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v3/4th Gen Core 
Processor Integrated Graphics Controller [1458:d000]
   Kernel driver in use: i915

  I'll upload more tests if I find anything newsworthy.

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