Bug 376295

Summary: Huge lags during windows resize
Product: [Plasma] kwin Reporter: razrfalcon
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED NOT A BUG    
Severity: normal    
Priority: NOR    
Version: 5.8.5   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Attachments: screenshot
attachment-28549-0.html

Description razrfalcon 2017-02-10 15:59:00 UTC
Created attachment 103956 [details]
screenshot

I'm using FPS "effect" to watch FPS drops and when I'm resizing an empty Kate windows - FPS drops down to 20-30fps. Also there are constant lags during usual operations, like windows switch, show desktop, etc.

This bugs disperses in some versions and then comes back again...

To remove tearing I'm using:
Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }"
in xorg.conf

In compositor settings:
Rendeing backend: OpenGL 3.1
vsync: never

According to system monitor: X process eats 25% of CPU during resizing.

nVidia GTX 960 and 375.26 driver
linux-4.4.39
Qt 5.6.2
Comment 1 Martin Flöser 2017-02-10 17:18:12 UTC
Created attachment 103959 [details]
attachment-28549-0.html

The screenshot you included has a this is not a benchmark.

But you used it as that. Any information gathered from it is useless.

From what I understand your issue is high cpu usage in xorg. You should report this to xorg.
Comment 2 razrfalcon 2017-02-10 17:47:14 UTC
But it shows actual data. It's not like fps dropped only in this widget. I see this lags by myself.

According to portage, last time I updated xorg at 09/19/2016. But this bugs begun few weeks ago. And the last kwin update 01/30/2017. Bingo!