Linux Today: Linux News On Internet Time.
Search Linux Today
Linux News Sections:  Developer -  High Performance -  Infrastructure -  IT Management -  Security -  Storage -
Linux Today Navigation
LT Home
Contribute
Contribute
Link to Us
Linux Jobs


Top White Papers

More on LinuxToday


Does A Greedy Intel Driver Improve Performance?

Apr 15, 2009, 22:02 (0 Talkback[s])
(Other stories by Michael Larabel)

[ Thanks to Michael Larabel for this link. ]

"With all of this invasive work going on, regressions are currently prevalent from stability problems to graphical corruption to slower 2D performance. While these are problems users will face with the new distribution updates in H1'09, some have been trying out different driver configurations in order to circumvent the situation. Canonical, for example, had been toying with the idea of enabling greedy migration heuristics by default.

"The migration heuristics deal with how pixmaps move to video memory, but when operating under the greedy mode, some acceleration routines are avoided, where some of the current performance problems seem to be taking place. This problem should ultimately be corrected in EXA and UXA, but for now, Canonical's Bryce Harrington has been considering setting the migration heuristics to greedy in order to increase the xf86-video-intel 2D performance. The MigrationHeuristics option can be set to greedy in the xorg.conf file.

"To see how much of a difference the greedy migration heuristics make, we decided to test out the different driver options. Using X Server 1.6 with the latest xf86-video-intel 2.6.3 driver from Ubuntu 9.04, we ran a set of benchmarks when the driver was using its default EXA acceleration method, EXA with the greedy migration heuristics, UXA acceleration, and then when reverting to the older xf86-video-intel 2.4.1 driver and using EXA acceleration. Previously we have found that UXA to offer faster performance, which is based upon the EXA API but uses the Graphics Execution Manager for managing its pixmaps."

Complete Story

Related Stories: