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The cost of performing relocations outweigh the advantages of using the blitter for solids with lots of rectangles. References: Bug 22127 - [UXA] 50% performance regression for XRenderFillRectangles https://bugs.freedesktop.org/show_bug.cgi?id=22127 By using the 3D pipeline we improve our performance by around 4x on i945, measured by the jxbench microbenchmark, and a factor of 10x by short-cutting to the 3D pipeline for blended rectangles. Before, on a i945GME: 19982.412060 Ops/s; rects (!); 15x15 9599.131693 Ops/s; rects (!); 75x75 3803.654743 Ops/s; rects (!); 250x250 6836.743772 Ops/s; rects blended; 15x15 1443.750000 Ops/s; rects blended; 75x75 495.335821 Ops/s; rects blended; 250x250 23247.933884 Ops/s; rects composition (!); 15x15 10993.073048 Ops/s; rects composition (!); 75x75 3595.905172 Ops/s; rects composition (!); 250x250 After: 87271.145975 Ops/s; rects (!); 15x15 32347.744361 Ops/s; rects (!); 75x75 5884.177215 Ops/s; rects (!); 250x250 73500.000000 Ops/s; rects blended; 15x15 33580.882353 Ops/s; rects blended; 75x75 5858.811749 Ops/s; rects blended; 250x250 25582.317073 Ops/s; rects composition (!); 15x15 6664.728682 Ops/s; rects composition (!); 75x75 14965.909091 Ops/s; rects composition (!); 250x250 [suspicious] This has no impact on Cairo, but I have a suspicion from watching xtrace that Qt likes to blit thousands of 1x1 rectangles with the same colour. However, we are still around 2-3x slower than the reported figures for EXA! Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> |
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README
xf86-video-intel Open-source X.org graphics driver for Intel graphics http://www.intellinuxgraphics.com/ What is xf86-video-intel ------------------------ The xf86-video-intel module is an open-source 2D graphics driver for the X Window System as implemented by X.org. It supports a variety of Intel graphics chipsets including: i810/i810e/i810-dc100,i815, i830M,845G,852GM,855GM,865G, 915G/GM,945G/GM/GME,946GZ G/GM/GME/Q965, G/Q33,G/Q35,G41,G/Q43,G/GM/Q45 PineView-M (Atom N400 series) PineView-D (Atom D400/D500 series) Where to get more information about the driver ---------------------------------------------- The primary source of information about this and other open-source drivers for Intel graphics is: http://intellinuxgraphics.org/ Documentation specific to the xf86-video-intel driver including possible configuration options for the xorg.conf file can be found in the intel(4) manual page. After installing the driver this documentation can be read with the following command: man intel Mailing list for communication with users and developers of xf86-video-intel: intel-gfx@lists.freedesktop.org Note: Subscription is required before posting, but anyone is free to subscribe. See instructions (and archives) here: http://lists.freedesktop.org/mailman/listinfo/intel-gfx To report bugs encountered with the driver, see: http://intellinuxgraphics.org/how_to_report_bug.html To see bugs that are targeted to be fixed in the next release: https://bugs.freedesktop.org/show_bug.cgi?id=intel-2d-release