1674475 - Judder while doing touchpad scroll on various Phoronix pages (sw-wr)

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P3)

Description

[Asif Youssuff]

Issues while scrolling various Phoronix pages; profiles listed below URLs.

https://www.phoronix.com/scan.php?page=home
Profile: https://share.firefox.dev/34EAby6

https://www.phoronix.com/scan.php?page=news_item&px=Linux-FBCON-To-Ditch-AS
Profile: https://share.firefox.dev/2HMzIkn

https://www.phoronix.com/forums/forum/phoronix/latest-phoronix-articles/1216298-linux-frame-buffer-console-to-drop-accelerated-scrolling-since-it-s-full-of-bugs
Profile: https://share.firefox.dev/3e9Vc6M

Comment 1

[Jim Blandy :jimb]

I don't see significant cs_rectangle_clip in the second URL (article), but I see about 18% non-idle time there when scrolling in the third URL (forum).

Comment 2

[Jeff Muizelaar [:jrmuizel]]

Asif, can you get a new profile?

Comment 3

[Jim Blandy :jimb]

Okay, I think I'm counting better now. On the forum URL, after landing bug 1676554, excluding idle time, and merging _memmove_avx_unaligned_erms into callers, I'm getting:

48% SkSpriteBlitter_Memcpy::blitRect
19% cs_clip_rectangle_frag::run

That's still a lot of time in the clip shader.

Comment 4

[Jim Blandy :jimb]

Okay, after bug 1676553 and bug 1674473, exclude idle time, we now have:

54% cs_clip_rectangle_frag::run
11% _memmove_avx_unaligned_erms from scale_blit

Comment 5

[Lee Salzman [:lsalzman]]

This has mostly been resolved by my recent clip rectangle and brush yuv work.