1125785 - Gecko BootAnimation slows down boot time by a couple of seconds

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: GonkIntegration, defect)

Description

[:gerard-majax]

While investigating boot time in context of bug 1100188 and bug 1124622, I have noticed that just having the bootanimation enabled slows down the boot process.

That was measured this way: time from "Starting bootanimation" to triggering "shell.start()". Measures where done with hacks from bug 1124622.

With bootanimation disabled (early return in "StartBootAnimation()"):
> alex@portable-alex:~/codaz/Mozilla/b2g/devices/Flame/B2G.KK$ egrep 'Starting bootanimation|settings.js: preload: |shell.js: start:|shell_start: ' settings-perfs4.log 
> 01-26 10:48:01.547  3370  3370 I         : Starting bootanimation with (1) format framebuffer
> 01-26 10:48:04.597  3370  3370 I GeckoDump: *** [PERF] settings.js: preload: 1ms
> 01-26 10:48:05.007  3370  3370 I GeckoDump: *** [PERF] shell.js: start: 0ms
> 01-26 10:48:05.877  3370  3370 I GeckoDump: *** [PERF] shell.js: shell_start: 869ms
> 01-26 10:49:36.957  3875  3875 I         : Starting bootanimation with (1) format framebuffer
> 01-26 10:49:39.927  3875  3875 I GeckoDump: *** [PERF] settings.js: preload: 0ms
> 01-26 10:49:40.287  3875  3875 I GeckoDump: *** [PERF] shell.js: start: 0ms
> 01-26 10:49:41.107  3875  3875 I GeckoDump: *** [PERF] shell.js: shell_start: 815ms

So that's 4.33s and 4.15s.

With bootanimation enabled:
> alex@portable-alex:~/codaz/Mozilla/b2g/devices/Flame/B2G.KK$ egrep 'Starting bootanimation|settings.js: preload: |shell.js: start:|shell_start: ' settings-perfs4.log 
> 01-26 10:42:57.847  2794  2794 I         : Starting bootanimation with (1) format framebuffer
> 01-26 10:43:03.887  2794  2794 I GeckoDump: *** [PERF] settings.js: preload: 0ms
> 01-26 10:43:04.257  2794  2794 I GeckoDump: *** [PERF] shell.js: start: 0ms
> 01-26 10:43:05.077  2794  2794 I GeckoDump: *** [PERF] shell.js: shell_start: 820ms
> alex@portable-alex:~/codaz/Mozilla/b2g/devices/Flame/B2G.KK$ egrep 'Starting bootanimation|settings.js: preload: |shell.js: start:|shell_start: ' settings-perfs4.log 
> 01-26 10:53:54.397  4521  4521 I         : Starting bootanimation with (1) format framebuffer
> 01-26 10:53:59.977  4521  4521 I GeckoDump: *** [PERF] settings.js: preload: 0ms
> 01-26 10:54:00.387  4521  4521 I GeckoDump: *** [PERF] shell.js: start: 0ms
> 01-26 10:54:01.237  4521  4521 I GeckoDump: *** [PERF] shell.js: shell_start: 854ms

So that's 7.23s and 6.84s.