Arch Linux

dhave

Arch Linux f@h Team Member

From: Outside the matrix.

Registered: 2005-05-15

Posts: 1,112

[SOLVED] [KDE4.1] Mucho cpu use with desktop effects enabled

With KDE4.1rc1+ desktop effects enabled, I'm consistently getting figures of 40-60 percent CPU usage, even when I'm not moving anything around the desktop.

With desktop effects disabled, CPU use is negligible.

This is on a Thinkpad T61p with a T9300 2.5GHz C2D processor, 4Gb RAM, nvidia Quadro FX 570M graphics, running Arch64.

Is this normal?

Last edited by dhave (2008-08-04 09:31:24)

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qubit

Member

Registered: 2007-04-25

Posts: 47

Re: [SOLVED] [KDE4.1] Mucho cpu use with desktop effects enabled

The problem could be your Nvidia graphics. Read this http://liquidat.wordpress.com/2008/07/2 … y-problem/ or this http://techbase.kde.org/User:Lemma/GPU-Performance mentioned by arch-dev.

Last edited by qubit (2008-07-24 20:05:46)

venky80

Member

Registered: 2007-05-13

Posts: 1,002

Re: [SOLVED] [KDE4.1] Mucho cpu use with desktop effects enabled

welcome to nvidia hell!

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Acer Aspire V5-573P Antergos KDE

attila

Member

Registered: 2006-11-14

Posts: 293

Re: [SOLVED] [KDE4.1] Mucho cpu use with desktop effects enabled

The link to the nvidia forum which is posted at the end of the GPU-Performance article from techbase.kde.org says that only 8000/9000 and higher cards are affected. So the question could be if the Quadro FX 570M has the same problem or it is another problem which is not from the nvidia driver. Hope this helps a little bit to locate better what is wrong.

dhave

Arch Linux f@h Team Member

From: Outside the matrix.

Registered: 2005-05-15

Posts: 1,112

Re: [SOLVED] [KDE4.1] Mucho cpu use with desktop effects enabled

Following a suggestion by Pierre, I disabled vsync, which helped dramatically. CPU usage -- with desktop effects enabled -- has dropped from 40-60 percent to < 10 percent, usually around 2-3 percent.

Vsync can be toggled under System Settings / Desktop Effects / General / Advanced Options. I tried all kinds of other xorg.conf tweaks and nvidia-settings options, but this is the one that really helped (the others, I'm not sure about).

Several other users have reported the same thing.

I'm tagging this "solved".

Last edited by dhave (2008-08-04 09:31:06)

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