[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity

2017-03-10 Thread Daniel van Vugt
User error. And truth is stranger than fiction as always...

Unity8 was freezing every 5 seconds because that's the ext3/ext4 journal
commit interval.

Unity8 was not doing the IO directly, but since it's being bypassed
through USC, is very time-sensitive. Fullscreen bypass holds buffers
back from the client for the duration of a frame. So the freeze was USC
periodically failing to return Unity8 a buffer in time. The problem with
USC as shown above was in its Mir compositor thread. I had configured it
to use --compositor-report=log, which although it writes very little
text, is subject to the ext3/ext4 journaling rules which force a
commit/sync every 5 seconds by default.

So the delay was USC's compositor thread writing to its log, which only
once every 5 seconds is a slow operation. Whenever the hiccup occurred,
that held back a bypass buffer from Unity8 a bit too long.

To add to the problem, Mir's Mesa-KMS driver does not allow more than
one frame to be pre-rendered so as to keep visual lag down. So it
sometimes didn't have a fresh U8 frame ready in time and would skip a
whole frame. There's no catch-up in the Mir Mesa-KMS driver, although
I've coincidentally been thinking about implementing it. But doesn't
matter; as soon as I turned off --compositor-report=log the bug was
solved.

** Changed in: canonical-devices-system-image
   Status: Confirmed => Invalid

** Changed in: unity-system-compositor
   Status: Confirmed => Invalid

** Changed in: unity-system-compositor (Ubuntu)
   Status: Confirmed => Invalid

** Changed in: unity8 (Ubuntu)
   Status: Confirmed => Invalid

** Changed in: qtmir (Ubuntu)
   Status: Confirmed => Invalid

** Changed in: canonical-devices-system-image
Milestone: u8c-1 => None

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Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Invalid
Status in Mir:
  Invalid
Status in Unity System Compositor:
  Invalid
Status in qtmir package in Ubuntu:
  Invalid
Status in unity-system-compositor package in Ubuntu:
  Invalid
Status in unity8 package in Ubuntu:
  Invalid

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, 

[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity

2017-03-10 Thread Daniel van Vugt
TID  PRIO  USER DISK READ  DISK WRITE  SWAPIN IO>COMMAND   
  265 be/3 root  0.00 K440.00 K  0.00 %  2.73 % [jbd2/sda2-8]
12778 be/4 root  0.00 K 56.00 K  0.00 %  1.79 % 
unity-syst~[Mir/Comp]
21082 be/4 root  0.00 K  0.00 K  0.00 %  0.45 % [kworker/u16:5]
19677 be/4 root  0.00 K  0.00 K  0.00 %  0.20 % [kworker/u16:3]
2 be/4 root  0.00 K  0.00 K  0.00 %  0.18 % [kworker/u16:0]
 1078 be/4 root  0.00 K  8.00 K  0.00 %  0.08 % accounts-daemon
 1230 be/4 syslog0.00 K 16.00 K  0.00 %  0.00 % rsyslogd -~ain 
Q:Reg]
19799 be/4 dan   0.00 K 88.00 K  0.00 %  0.00 % upstart --user
20013 be/4 dan   0.00 K  4.00 K  0.00 %  0.00 % unity8 
--m~full-shell

** Changed in: unity-system-compositor (Ubuntu)
   Importance: Undecided => High

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Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Invalid
Status in Unity System Compositor:
  Confirmed
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity

2017-03-09 Thread Daniel van Vugt
TID  PRIO  USER DISK READ  DISK WRITE  SWAPIN IO>COMMAND   
  265 be/3 root  0.00 K 28.00 K  0.00 %  2.21 % [jbd2/sda2-8]
19799 be/4 dan   0.00 K  8.00 K  0.00 %  0.83 % upstart --user
21082 be/4 root  0.00 K  0.00 K  0.00 %  0.37 % [kworker/u16:5]
16506 be/4 root  0.00 K  0.00 K  0.00 %  0.34 % [kworker/u16:1]
12778 be/4 root  0.00 K  8.00 K  0.00 %  0.00 % 
unity-syst~[Mir/Comp]

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Invalid
Status in Unity System Compositor:
  Confirmed
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity

2017-03-09 Thread Daniel van Vugt
Strangely iotop is showing unity-system-compositor's "Mir/Comp" thread
is one of the top disk writers. If that's the problem then USC holding
on to bypass frames too long would explain it.

** Also affects: unity-system-compositor
   Importance: Undecided
   Status: New

** Changed in: unity-system-compositor
   Importance: Undecided => High

** Changed in: unity-system-compositor
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity-system-compositor in
Ubuntu.
https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Invalid
Status in Unity System Compositor:
  Confirmed
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity

2017-03-09 Thread Daniel van Vugt
** Also affects: unity-system-compositor (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: unity8 (Ubuntu)
   Status: Triaged => Confirmed

** Changed in: unity-system-compositor (Ubuntu)
   Status: New => Confirmed

** Changed in: qtmir (Ubuntu)
   Status: Triaged => Confirmed

** Changed in: canonical-devices-system-image
   Status: Triaged => Confirmed

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity-system-compositor in
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https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Invalid
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds

2017-03-09 Thread Daniel van Vugt
OK, the issue is not TutorialContent.qml because modifying that makes no
difference.

However I now notice my harddisk LED lights up every time the rendering
stutters. So you know what that means :)

** Summary changed:

- [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds
+ [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in 
unison with disk activity

** Changed in: mir
   Status: Confirmed => Invalid

** Changed in: canonical-devices-system-image
   Status: Confirmed => Triaged

** Changed in: qtmir (Ubuntu)
   Status: Confirmed => Triaged

** Changed in: unity8 (Ubuntu)
   Status: Confirmed => Triaged

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds in unison with disk activity

Status in Canonical System Image:
  Triaged
Status in Mir:
  Invalid
Status in qtmir package in Ubuntu:
  Triaged
Status in unity8 package in Ubuntu:
  Triaged

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds

2017-03-08 Thread Daniel van Vugt
TODO: Check if these are related:

plugins/Utils/constants.cpp:m_indicatorValueTimeout = 5000;
qml/Tutorial/TutorialContent.qml:interval: 5000

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Confirmed
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds

2017-02-13 Thread Daniel van Vugt
** Changed in: canonical-devices-system-image
   Status: New => Confirmed

** Changed in: mir
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Confirmed
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds

2017-02-13 Thread Launchpad Bug Tracker
Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: qtmir (Ubuntu)
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds

Status in Canonical System Image:
  New
Status in Mir:
  New
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1664150/+subscriptions

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[Touch-packages] [Bug 1664150] Re: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds

2017-02-13 Thread Launchpad Bug Tracker
Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: unity8 (Ubuntu)
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1664150

Title:
  [performance] Unity8 rendering hiccups/stutters exactly every 5
  seconds

Status in Canonical System Image:
  New
Status in Mir:
  New
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
  large continuously rendering window (e.g. eglplasma or egltriangle),
  the Unity8 shell hiccups and visually stutters exactly every 5
  seconds.

  According to MIR_CLIENT_PERF_REPORT it's quite major, missing
  somewhere around 9 frames every 5 seconds. This matches what I see on
  screen - a large number of frames skipped once every five seconds...

  [2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer 
lag 66.31ms (4 buffers)
  [2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer 
lag 78.10ms (4 buffers)
  [2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer 
lag 66.35ms (4 buffers)
  [2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.33ms (4 buffers)
  [2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer 
lag 78.09ms (4 buffers)
  [2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)
  [2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer 
lag 66.32ms (4 buffers)

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