538655 - Content Sink preferences investigation

Status: RESOLVED FIXED

(Firefox for Android Graveyard :: General, defect)

Description

[Doug Turner (:dougt)]

Attachment: raw data on content sink pref (maybe the first xlsx attachment to m.b.o)

Comment 1

[Doug Turner (:dougt)]

Using a build from Jan 6, from the tip of mobile-browser and mozilla-1.9.2.

* Disk cache is off
* Plugins are off.

The build has two points instrumented to collect data:

* Page load timing

I have added hooks in the onStateChange function in browser.js to record the total page load time. 

* Panning delta times

This is a crude way of measuring panning performance similar to tpan.  The time deltas are based on the mouse events the front end sees.  Basically, if the application is busing rendering, these delta times will increase.  Long delays can be observe visually (e.g., a delta of > 500ms  can be seen as a pause while panning).

Steps

1) Modified content sink preference
2) started fennec on the command line
3) Loaded target url via the awesome bar
4) Waited until page completed
5) Reloaded target url 5 times
6) Repeated steps 3-5 for each of the target urls
6) Reloaded techcrunch.com and while the page was loaded proceed to pan in random directions which included bring out the sidebars

I varied the deflection count and parse time looking for values that would keep raw load time consistent with the control (deflection count = 10, parse time = 50000) and decreased max time between mouse moves

Comment 2

[Doug Turner (:dougt)]

based on the data, i found 

interactive Mode - deflection count = 1000; parse time = 5000

to be probably the best we can do to both ensure page load time and page interactive while loading.

Comment 3

[Doug Turner (:dougt)]

Attachment: patch v.1

** we need to watch page load time regressions after this lands. **

Comment 4

[Doug Turner (:dougt)]

http://hg.mozilla.org/mobile-browser/rev/63446b25814c

Comment 5

[Doug Turner (:dougt)]

from data that mfinkle collected, it look like this improved tp4 by 30%!