Can you repro this reliably? If so can you attach a trace of the problem here? See: https://www.chromium.org/developers/how-tos/trace-event-profiling-tool/recording-tracing-runs

Hi,

Sure, no problem. Can do whatever you need, just was unable to these days due to a higher work load.

Please see the attached file. Seems some evdev stuff is using a lot of CPU but not sure how this reads.

Coupled with this, closing and changing tabs has been stalling again, which was a problem that had gone away a while back.

I'm now updated to the latest version:

Version 58.0.3029.140
Platform 9334.72.0 (Official Build) stable-channel daisy_spring
Firmware Google_Spring.3824.129.0

Deleted: trace_Moving_Mouse.json.gz 5.6 MB

trace_Moving_Mouse.json.gz 5.6 MB Download

Thank you for providing more feedback. Adding requester "enne@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Thanks so much for the trace.

The GPU looks pretty idle.

I'm not 100% sure what's going on here, but looking at the trace, there's a bunch of spurts of 100ms BrowserBlockingWorker work that eats up an entire cpu.  This happens a couple of times a second.  It looks like it's all from task_group_sampler.cc, so CCing erikchen and thestig to investigate.

Deleted: trace_Moving_Mouse.png 114 KB

	trace_Moving_Mouse.png 114 KB View Download

wutao, can you please investigate? Thanks!

Is this related? https://bugs.chromium.org/p/chromium/issues/detail?id=704763#c44
But it is supposed to be fixed in M58 branch 3029.

@comment #6

You're welcome. Just let me know if you need more.

I mentioned the GPU because I noticed that when the CPU spikes, the GPU process also goes from ~10% to 30-35% just from moving the cursor. Seems like an awful lot of increase in processing for something so simple - not sure if it is significant though.

+danakj@. This could be related to  issue 704763 ?

On Kevin, I can repeat this on the following versions.
The CPU could as high as 80% and GPU as high as 50%, especially when I move the mouse back and force crossing browser's bookmarks and thumbnials, even for blank page. It seems the rendering of shadows and tooptips are expensive.

M58 stable: 9334.72.0/58.0.3029.140
M59 beta: 9460.42.0/59.0.3071.57
M60 dev: (TOT) 	9583.0.0/60.0.3109.0

When you move around on the bookmark bar you paint and raster the bar. I don't know how much work is cached there, but anything that changes has to be rastered, uploaded, etc. This has nothing to do with the renderer, so blank page not related.

You could try comment out tooltips so they dont happen and see what it looks like, same for parts of teh bookmarks, if you want to one way to measure each piece other than looking at traces.

Hi danakj@, could you please help to find right owner for this. Thanks.