xf86-video-savage: (2/2) Implement AGPforXv option
Alex Villacís Lasso
a_villacis at palosanto.com
Tue Dec 30 09:36:29 PST 2008
This patch adds the capability to place YV12 data in AGP memory while it
is being converted to packed YUY2. The single most expensive operation
in XVideo rendering on savage (on current implementation) is the upload
to the framebuffer. By placing YV12 data in an AGP buffer, the CPU saves
itself the work of going through the PCI bus. From benchmarks, this
method cuts the upload overhead by up to 25% compared to the
framebuffer-upload implementation. An option (AGPforXv) has been added
to enable this behavior conditionally (disabled by default). Please
review and comment on this.
* Allow YV12 planar data to reside in AGP memory
* Add AGPforXv switch for enabling/disabling implemented behavior
* Update manual to document AGPforXv switch
* Add explanation of limitations of BCI conversion
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'
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