The Cost Of ATI Kernel Mode-Setting On Fedora 12
One of the articles on Phoronix last week was entitled Intel Linux Graphics Shine With Fedora 12, which showed off the nice state of Intel graphics on this latest Red Hat release when it came to kernel mode-setting and its 3D stack with it working well "out of the box" and offering some nice performance gains over the earlier Fedora 10 and Fedora 11 releases. While the Intel stack may be improved in Constantine, the ATI support has taken a hit, as users were quick to point out in response to last week's article. In particular, when using the ATI kernel mode-setting driver in Fedora 12 (which is the default for pre-R600 hardware), there is a large performance discrepancy compared to using the traditional user-space mode-setting for ATI Radeon hardware. Today we are looking at what exactly the performance cost is for using ATI KMS in this new release.
Fedora has been shipping ATI kernel mode-setting support for the R500 series going back to the Fedora 10 release. ATI kernel mode-setting support did not appear in the mainline Linux kernel until recently when it entered the Linux 2.6.31 kernel as a staging driver, where it continues to remain today. Internally the ATI kernel mode-setting code is dependent upon TTM, which also entered the Linux 2.6.31 kernel. Kernel mode-setting and 3D support for the newer ATI R600/700 (Radeon HD 2000, 3000, 4000 series) has been actively under development for some months and can now be found in the "master" branches for most of the code repositories.
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