[wpe-webkit] Optimising imx6 performance for HTML5 using Cog + WPE WebKit

Wouter Vanhauwaert W.Vanhauwaert at TELEVIC.com
Tue Oct 29 02:29:56 PDT 2019

> -----Original Message-----
> From: webkit-wpe [mailto:webkit-wpe-bounces at lists.webkit.org] On Behalf Of
> Andy Pont
> Sent: woensdag 23 oktober 2019 13:27
> To: meta-freescale Mailing List <meta-freescale at yoctoproject.org>
> Cc: yocto at yoctoproject.org; webkit-wpe at lists.webkit.org
> Subject: [wpe-webkit] Optimising imx6 performance for HTML5 using Cog +
> WPE WebKit
> Hello,
> Broadening this out to the Freescale and Yocto mailing lists to see if any one
> has any answers…
> We are using Cog and WPE Webkit on an i.MX6 Solo based board with a user
> interface that is based on HTML5, Javascript and CSS and are having some
> issues with fading and other canvas effects.  The board is running a Yocto
> image with the following in conf/local.conf:
> PREFERRED_PROVIDER_virtual/wpebackend = "wpebackend-rdk"
> PACKAGECONFIG_pn-wpebackend-rdk = "imx6"
> PACKAGECONFIG_append_pn-cairo = " glesv2 egl"
> PACKAGECONFIG_append_pn-wpewebkit = " 2dcanvas"
> We start the browser with the following command line:
> cog --enable-accelerated-2d-canvas=1 appui/index.html
> Are there any other settings we should be using either in the Yocto build or
> when launching Cog as we are finding the CPU usage is >90%?
> Is there a definitive way to show that all of the necessary drivers are loaded
> and Cog is making use of the GPU?
> I have tried this with Cog 0.3.0 built with WPE WebKit 2.24.1 and Cog
> 0.4.0 built with WPE WebKit 2.26.1 and both give the same dissappointing
> results, as does running on the iMX6Q-SDP board I also have here.

Problem with 'interface based on HTML5, javascript and CSS', is that it can be done in a thousand ways...
Some of them will fall back to hardware, and some of them will need calculation so take CPU time.
Without an insight in a code-abstraction, it's impossible to tell what the issue is.

https://medium.com/outsystems-experts/how-to-achieve-60-fps-animations-with-css3-db7b98610108 => some hints on how to improve mobile performance
https://www.sitepoint.com/introduction-to-hardware-acceleration-css-animations/ => some more hints to leverage functions to hardware

But I also don't reach 60fps on imx6 (yet?)


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