1497627 - Bad performance on running tscrollx talos test

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, enhancement, P5)

Description

[Kartikaya Gupta (email:[e-mail])]

https://treeherder.mozilla.org/perf.html#/graphs?series=autoland,1646671,1,1&series=autoland,1651370,1,1&series=autoland,1686482,1,1&series=autoland,1683637,1,1

With WR enabled we're worse on both Windows and Linux.

Comment 1

[Bobby Holley (:bholley)]

Bug 1500017 made a big dent here, taking us from ~1.75 to ~1.2, with a non-WR baseline of ~0.9.

https://treeherder.mozilla.org/perf.html#/graphs?series=mozilla-inbound,1686555,1,1&series=autoland,1686482,1,1&series=mozilla-inbound,1642832,1,1

Comment 2

[Matt Woodrow (:mattwoodrow)]

This is down to 1.15 vs 0.83 - https://treeherder.mozilla.org/perf.html#/graphs?series=mozilla-central,1662892,1,1&series=mozilla-central,1538140,1,1

That's an absolute different of less than a quarter of a millisecond per frame, on a test where we're a long way under the 16.7ms threshold for missing frames.

I've done an initial investigation here and concluded that the difference is mainly because WebRender does more work in the compositing phase, which is part of the design.

Given the low impact here, dropping the priority so we can focus on bigger performance issues.

Comment 3

[Glenn Watson [:gw]]

There is only WR.