DRM/DRI Update

Nicola Mfb nicola.mfb at gmail.com
Wed May 6 14:22:46 CEST 2009

2009/5/6 Lars-Peter Clausen <lars at metafoo.de>:
> I've also been experimenting with exporting the glamo interrupts to
> userspace through a device file. Currently when under load the driver
> spends most time busy looping and waiting for the glamo to finish the
> blit operations. I guess for the new interface we would need some kind
> of blocking ioctl to put userspace to sleep until the bliting
> operations have been completed and the cmdq is empty. What's your
> opinion on this?

I asked this for a long time as some tests blitting from video memory
to video memory shows unacceptable high cpu time, while it should be
near to 0.
Yelding userspace should brings up average speed of device and realize
some nice and smooth scrolling widgets even without dri.


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