Interrupts and wakeups: CPU waste.

[knefas]

This is solved in the new driver (.19), and is working like a charm for now.

Thanks NVIDIA!

[migish]

Originally Posted by knefas

This is solved in the new driver (.19), and is working like a charm for now.

Thanks NVIDIA!

What do you mean 'solved'? I'm using version 100.14.19 (this is the one you are refering to, right?) and I get 60 wakeups per second (~120 when I use two monitors).

Could you elaborate on that, please?

[netllama]

Per the driver README:

Option "OnDemandVBlankInterrupts" "boolean"

Normally, VBlank interrupts are generated on every vertical refresh of
every display device connected to the GPU(s) installed in a given system.
This experimental option enables on-demand VBlank control, allowing the
driver to enable VBlank interrupt generation only when it is required.
This can help conserve power.

Default: off (on-demand VBlank control is disabled).

[tier]

Originally Posted by migish

What do you mean 'solved'? I'm using version 100.14.19 (this is the one you are refering to, right?) and I get 60 wakeups per second (~120 when I use two monitors). Have you disabled DRI?

Could you elaborate on that, please?

Please note: although not listed in the release highlights, this driver release has experimental support for on-demand VBLANK interrupt generation, which can significantly lower the number of GPU interrupts generated per second on many systems. Please see the documenation for the OnDemandVBlankInterrupts X driver option in the README for additional information.

http://www.nvnews.net/vbulletin/showthread.php?t=98635
Read it. Use it. Be Happy :P

[migish]

Originally Posted by netllama

Per the driver README:

Option "OnDemandVBlankInterrupts" "boolean"

Normally, VBlank interrupts are generated on every vertical refresh of
every display device connected to the GPU(s) installed in a given system.
This experimental option enables on-demand VBlank control, allowing the
driver to enable VBlank interrupt generation only when it is required.
This can help conserve power.

Default: off (on-demand VBlank control is disabled).

That did the trick for me! nvidia no longer appears on the powertop list.

netllama, tier thank you for your quick response.

[pigeon]

I just started trying OnDemandVBlankInterrupts out, and nvidia doesn't appear high up in powertop anymore.

On the other hand, I noticed with compiz, animations such as going into expo mode, scale mode, switching viewport/desktop *sometimes* look more jerky. Is this behavior normal?