mozilla-mobile
~46ms regression to COLD VIEW nav start (Sentry SDK?)
On 3/10, we see a regression of about ~46ms from our weekly backfill (that I don't think we see in fenix):
Let's find the cause. You can use backfill.py to bisect the commit that caused the issue – let me know if you have questions.
Triage: jonalmeida suggested we landed the Sentry SDK on that day so that's probably what changed.
We're seeing a trend upwards in both VIEW and MAIN: it's unclear if it's related to Sentry or another regression. Since there's no clear point of "regression", I'm going to leave the investigation as part of this bug.
Using backfill.py I measured for Focus Nightly the cold start up duration(cold_view_nav_start) before and after this pr As you can see the median values are pretty similar(19ms)
Results for 03.09.2022 vs 03.08.2022
On the other hand I noticed a considerable difference after this pr I will take a look in AC to see what changes were made in that update
Results for 03.10.2022
@jonalmeida @mcomella After some investigation made with git bisect in AC I noticed a regression after this change
Before gecko update
With gecko update
@jonalmeida I don't have the setup for going lower in geckoview and trying to find there the regression. Should I open a ticket on Bugzilla?
If you wanted to continue debugging, you can take a profile before the change and after the change and compare to see what's different. Since the Firefox Profiler doesn't start profiling that early during start up, you may want to capture the profile using the Debug API. Since the change is small, however, it might be hard to spot. fwiw, if you share the profiles or identify the cause, that could make the bug more actionable for the folks working on geckoview when you file that Bugzilla ticket.
Unfortunately I don't have a device with an android version < 11 and I can't set the permissions to capture the profile using the Debug API I tried with emulators also but I didn't succeed I will unassign this from me, maybe someone else can help
Moved to bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1802645
Change performed by the Move to Bugzilla add-on.
