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2D Support On Old Intel Hardware: Nothing But Misery

Intel

Published on 17 December 2012 03:11 PM EST
Written by Michael Larabel in Intel
4 Comments

While Intel finally has stable i830/i845 graphics support for the decade-old Intel hardware that was notorious in recent years on Linux since the GEM/KMS migration, the 2D acceleration support is "nothing but misery" as described by an open-source Intel Linux developer.

Chris Wilson has done some i845G benchmarking now that the xf86-video-intel driver is finally stable with this hardware when using the Graphics Execution Manager.

In terms of i845G with the default UXA 2D acceleration method, Chris says, "The sad fact is that UXA is inadequate for the challenge of accelerating the Render protocol."

Wilson's summary for using the newer SNA acceleration architecture with the vintage i845G chipset comes down to:
We find a much happier result. In all cases the performance is at least as good as using a software rasteriser in the X server, and often much better than if we avoided the Render protocol entirely and did the rasterisation in the client. With a little more tuning, we may be able to achieve parity even in the worst case – if we can win on an old GPU with an ancient CPU (single core, virtually no cache and even less memory bandwidth) we should be able to excel on more recent GPUs and CPUs, and be more efficient in the process.

Yet, the Render protocol is not the be-all-and-end-all of acceleration. We need to keep an eye on the basics as well, the copies, the fills and the uploads, to know if we are achieving our goals. The basic premise is that using the driver (and thus the GPU) is faster than just using the CPU for everything. (In reality, the choice is more complicated because we have to consider the efficacy of GPU offload for enabling the CPU to get on with other tasks and overall power efficiency.)
In ending his new blog post, Chris Wilson writes, "So it appears that using the GPU for basic operations such as moving the windows about is only at most a marginal win over using a shadow buffer (and often times UXA fails at even that). Overall then it seems that enabling UXA should bring nothing but misery."

At least Intel graphics hardware has improved dramatically in the past decade with Sandy Bridge and Ivy Bridge being quite competitive for integrated graphics and backed by a top-notch open-source Linux graphics stack.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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